diff --git a/mlir/include/mlir/IR/PatternMatch.h b/mlir/include/mlir/IR/PatternMatch.h
--- a/mlir/include/mlir/IR/PatternMatch.h
+++ b/mlir/include/mlir/IR/PatternMatch.h
@@ -1089,10 +1089,9 @@
 template <typename PDLFnT, std::size_t... I>
 void assertArgs(PatternRewriter &rewriter, ArrayRef<PDLValue> values,
                 std::index_sequence<I...>) {
-  using FnTraitsT = llvm::function_traits<PDLFnT>;
-
   // We only want to do verification in debug builds, same as with `assert`.
 #if LLVM_ENABLE_ABI_BREAKING_CHECKS
+  using FnTraitsT = llvm::function_traits<PDLFnT>;
   auto errorFn = [&](const Twine &msg) -> LogicalResult {
     llvm::report_fatal_error(msg);
   };