diff --git a/Makefile.in b/Makefile.in
index af1bd61..98655bb 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -440,6 +440,7 @@
   $(TOP)/ext/misc/ieee754.c \
   $(TOP)/ext/misc/mmapwarm.c \
   $(TOP)/ext/misc/nextchar.c \
+  $(TOP)/ext/misc/normalize.c \
   $(TOP)/ext/misc/percentile.c \
   $(TOP)/ext/misc/regexp.c \
   $(TOP)/ext/misc/remember.c \
diff --git a/Makefile.msc b/Makefile.msc
index 4d6c5c0..640f95d 100644
--- a/Makefile.msc
+++ b/Makefile.msc
@@ -1500,6 +1500,7 @@
   $(TOP)\ext\misc\ieee754.c \
   $(TOP)\ext\misc\mmapwarm.c \
   $(TOP)\ext\misc\nextchar.c \
+  $(TOP)\ext\misc\normalize.c \
   $(TOP)\ext\misc\percentile.c \
   $(TOP)\ext\misc\regexp.c \
   $(TOP)\ext\misc\remember.c \
diff --git a/ext/misc/normalize.c b/ext/misc/normalize.c
index a3c0021..fd656f1 100644
--- a/ext/misc/normalize.c
+++ b/ext/misc/normalize.c
@@ -130,7 +130,7 @@
 ** handle case conversions for the UTF character set since the tables
 ** involved are nearly as big or bigger than SQLite itself.
 */
-const unsigned char sqlite3UpperToLower[] = {
+static const unsigned char sqlite3UpperToLower[] = {
       0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 17,
      18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
      36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
@@ -176,7 +176,7 @@
 ** non-ASCII UTF character. Hence the test for whether or not a character is
 ** part of an identifier is 0x46.
 */
-const unsigned char sqlite3CtypeMap[256] = {
+static const unsigned char sqlite3CtypeMap[256] = {
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 00..07    ........ */
   0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00,  /* 08..0f    ........ */
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 10..17    ........ */
diff --git a/main.mk b/main.mk
index fc68d9d..6271e4b 100644
--- a/main.mk
+++ b/main.mk
@@ -361,6 +361,7 @@
   $(TOP)/ext/misc/ieee754.c \
   $(TOP)/ext/misc/mmapwarm.c \
   $(TOP)/ext/misc/nextchar.c \
+  $(TOP)/ext/misc/normalize.c \
   $(TOP)/ext/misc/percentile.c \
   $(TOP)/ext/misc/regexp.c \
   $(TOP)/ext/misc/remember.c \
diff --git a/manifest b/manifest
index 2c752a4..14067d0 100644
--- a/manifest
+++ b/manifest
@@ -1,10 +1,10 @@
-C Special\shandling\sof\sthe\sNULL\skeyword.\s\sSometimes\sit\sis\sa\sliteral,\sand\ssometimes\nit\sis\sa\skeyword.
-D 2018-01-08T19:29:28.438
+C Test\scases\sfor\ssqlite3_normalize().
+D 2018-01-08T20:04:57.992
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
-F Makefile.in 12b6daa4bdb03fa87da27cbc205ff88ace645475b5be79414a3038b68ade14cb
+F Makefile.in 822052988bbf6204ca2c3e2665618b5a48acec24105d5afa8c4ebb59cb941d3e
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
-F Makefile.msc b33f630258ce72fb3150c1a6819a484eba3950dc9397571d48672087e12abf4a
+F Makefile.msc 0f2875c7d4cb93ae4dab661f58f9d68699d323cfb87ebd7d8dccbb9949979b83
 F README.md eeae1e552f93ef72ef7c5b8f6647b368a001c28820ad1df179d3dae602bef681
 F VERSION 0c10cdfed866fdd2d80434f64f042c3330f1daaed12e54287beb104f04b3faaf
 F aclocal.m4 a5c22d164aff7ed549d53a90fa56d56955281f50
@@ -284,7 +284,7 @@
 F ext/misc/memvfs.c ab36f49e02ebcdf85a1e08dc4d8599ea8f343e073ac9e0bca18a98b7e1ec9567
 F ext/misc/mmapwarm.c 70b618f2d0bde43fae288ad0b7498a629f2b6f61b50a27e06fae3cd23c83af29
 F ext/misc/nextchar.c 35c8b8baacb96d92abbb34a83a997b797075b342
-F ext/misc/normalize.c f26e69c7539f74dbc0a00468df117bb9085f229ecb64d65c10ebf59a010511bb
+F ext/misc/normalize.c 19262ef3ef29d4de2f281b423326865c8916c63d0cb09f1dc98d24d5c1e8ba64
 F ext/misc/percentile.c 92699c8cd7d517ff610e6037e56506f8904dae2e
 F ext/misc/regexp.c a68d25c659bd2d893cd1215667bbf75ecb9dc7d4
 F ext/misc/remember.c add730f0f7e7436cd15ea3fd6a90fd83c3f706ab44169f7f048438b7d6baa69c
@@ -407,7 +407,7 @@
 F install-sh 9d4de14ab9fb0facae2f48780b874848cbf2f895 x
 F ltmain.sh 3ff0879076df340d2e23ae905484d8c15d5fdea8
 F magic.txt 8273bf49ba3b0c8559cb2774495390c31fd61c60
-F main.mk 7965d01485f7bec7945407c5238985ea8c7cb2cb686d2bfdbe3d5f79d6fd4eb2
+F main.mk c6b8ee2fa871e01ad6a460d750cd074010292464a60a37a2207930ae0df629dc
 F mkso.sh fd21c06b063bb16a5d25deea1752c2da6ac3ed83
 F mptest/config01.test 3c6adcbc50b991866855f1977ff172eb6d901271
 F mptest/config02.test 4415dfe36c48785f751e16e32c20b077c28ae504
@@ -494,7 +494,7 @@
 F src/status.c 9737ed017279a9e0c5da748701c3c7bf1e8ae0dae459aad20dd64fcff97a7e35
 F src/table.c b46ad567748f24a326d9de40e5b9659f96ffff34
 F src/tclsqlite.c 1833388c01e3b77f4c712185ee7250b9423ee0981ce6ae7e401e47db0319a696
-F src/test1.c b52f9e7fe62016d357c3266fcfa0793cc1883d3cb2b11dfa39fcba2e70b0305c
+F src/test1.c 1ab7cbbb6693e08364c1a9241e2aee17f8c4925e4cc52396be77ae6845a05828
 F src/test2.c 3efb99ab7f1fc8d154933e02ae1378bac9637da5
 F src/test3.c b8434949dfb8aff8dfa082c8b592109e77844c2135ed3c492113839b6956255b
 F src/test4.c 18ec393bb4d0ad1de729f0b94da7267270f3d8e6
@@ -1093,6 +1093,7 @@
 F test/nan.test 437d40e6d0778b050d7750726c0cbd2c9936b81962926e8f8c48ca698f00f4d1
 F test/nockpt.test 9a436a7213ba5ef7a32304998d386d3ea3f76c9d
 F test/nolock.test f196cf8b8fbea4e2ca345140a2b3f3b0da45c76e
+F test/normalize.test 501630ab49b0b26b65c74124bf03e3374c1b57fa97aae750f84803609141d167
 F test/notify1.test 669b2b743618efdc18ca4b02f45423d5d2304abf
 F test/notify2.test 2ecabaa1305083856b7c39cf32816b612740c161
 F test/notify3.test 10ff25cde502e72a92053a2f215d64bece4ef934
@@ -1698,7 +1699,7 @@
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P d77dbb398afa80c1b3373c55f278491e83d5c80ddc22dbc303876bdcbc127df9
-R 52c05b49206cf2984d560c493371a137
+P db5d138e97f22ad4d4d11dbef96df93696ba0e557809066bc263ca3c3898f349
+R 5585a6831c91176202d5e0f81c59c944
 U drh
-Z 26ab19c5b91f60ca62a12106abc7db8e
+Z ca698384a23dd84f9bb875fa9da10ba1
diff --git a/manifest.uuid b/manifest.uuid
index c338d86..ac2ec7c 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-db5d138e97f22ad4d4d11dbef96df93696ba0e557809066bc263ca3c3898f349
\ No newline at end of file
+658f42257d56a3562dfa8e55023c6e497f55c565cd751d942de3a9e0cb2fa708
\ No newline at end of file
diff --git a/src/test1.c b/src/test1.c
index 55d92eb..bc8f389 100644
--- a/src/test1.c
+++ b/src/test1.c
@@ -4560,6 +4560,35 @@
 }
 
 /*
+** Usage: sqlite3_normalize SQL
+**
+** Return the normalized value for an SQL statement.
+*/
+static int SQLITE_TCLAPI test_normalize(
+  void * clientData,
+  Tcl_Interp *interp,
+  int objc,
+  Tcl_Obj *CONST objv[]
+){
+  char *zSql;
+  char *zNorm;
+  extern char *sqlite3_normalize(const char*);
+
+  if( objc!=2 ){
+    Tcl_WrongNumArgs(interp, 1, objv, "SQL");
+    return TCL_ERROR;
+  }
+
+  zSql = (char*)Tcl_GetString(objv[1]);
+  zNorm = sqlite3_normalize(zSql);
+  if( zNorm ){
+    Tcl_SetObjResult(interp, Tcl_NewStringObj(zNorm, -1));
+    sqlite3_free(zNorm);
+  }
+  return TCL_OK;
+}
+
+/*
 ** Usage: sqlite3_step STMT
 **
 ** Advance the statement to the next row.
@@ -7547,6 +7576,7 @@
      { "sqlite3_open16",                test_open16        ,0 },
      { "sqlite3_open_v2",               test_open_v2       ,0 },
      { "sqlite3_complete16",            test_complete16    ,0 },
+     { "sqlite3_normalize",             test_normalize     ,0 },
 
      { "sqlite3_prepare",               test_prepare       ,0 },
      { "sqlite3_prepare16",             test_prepare16     ,0 },
diff --git a/test/normalize.test b/test/normalize.test
new file mode 100644
index 0000000..8932650
--- /dev/null
+++ b/test/normalize.test
@@ -0,0 +1,72 @@
+# 2018-01-08
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+#
+# Tests for the sqlite3_normalize() extension function.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set testprefix normalize
+
+foreach {tnum sql norm} {
+  100
+  {SELECT * FROM t1 WHERE a IN (1) AND b=51.42}
+  {select*from t1 where a in(?,?,?)and b=?;}
+
+  110
+  {SELECT a, b+15, c FROM t1 WHERE d NOT IN (SELECT x FROM t2);}
+  {select a,b+?,c from t1 where d not in(select x from t2);}
+
+  120
+  { SELECT NULL, b FROM t1 -- comment text
+     WHERE d IN (WITH t(a) AS (VALUES(5)) /* CTE */
+                 SELECT a FROM t)
+        OR e='hello';
+  }
+  {select?,b from t1 where d in(with t(a)as(values(?))select a from t)or e=?;}
+
+  121
+  {/*Initial comment*/
+   -- another comment line
+   SELECT NULL  /* comment */ , b FROM t1 -- comment text
+     WHERE d IN (WITH t(a) AS (VALUES(5)) /* CTE */
+                 SELECT a FROM t)
+        OR e='hello';
+  }
+  {select?,b from t1 where d in(with t(a)as(values(?))select a from t)or e=?;}
+
+  130
+  {/* Query containing parameters */
+   SELECT x,$::abc(15),y,@abc,z,?99,w FROM t1 /* Trailing comment */}
+  {select x,?,y,?,z,?,w from t1;}
+
+  140
+  {/* Long list on the RHS of IN */
+   SELECT 15 IN (1,2,3,(SELECT * FROM t1),'xyz',x'abcd',22*(x+5),null);}
+  {select?in(?,?,?);}
+
+  150
+  {SELECT x'abc'; -- illegal token}
+  {}
+
+  160
+  {SELECT a,NULL,b FROM t1 WHERE c IS NOT NULL or D is null or e=5}
+  {select a,?,b from t1 where c is not null or d is null or e=?;}
+
+  170
+  {/* IN list exactly 5 bytes long */
+   SELECT * FROM t1 WHERE x IN (1,2,3);}
+  {select*from t1 where x in(?,?,?);}
+} {
+  do_test $tnum [list sqlite3_normalize $sql] $norm
+}
+
+finish_test