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PiperOrigin-RevId: 807272083
diff --git a/fuzztest/internal/domains/in_grammar_impl.h b/fuzztest/internal/domains/in_grammar_impl.h
index cda2193..64d91dc 100644
--- a/fuzztest/internal/domains/in_grammar_impl.h
+++ b/fuzztest/internal/domains/in_grammar_impl.h
@@ -516,7 +516,7 @@
     if (!CheckASTNodeTypeIdAndChildType<std::vector<ASTNode>>(astnode, id)) {
       return absl::InvalidArgumentError("Not a vector!");
     }
-    if (std::get<std::vector<ASTNode>>(astnode.children).size() ==
+    if (std::get<std::vector<ASTNode>>(astnode.children).size() !=
         sizeof...(ElementT)) {
       return absl::InvalidArgumentError("Tuple elements number doesn't match!");
     }