diff --git a/velox/core/SimpleFunctionMetadata.h b/velox/core/SimpleFunctionMetadata.h
index 4c4d31429ccd..e9b9dac585be 100644
--- a/velox/core/SimpleFunctionMetadata.h
+++ b/velox/core/SimpleFunctionMetadata.h
@@ -591,7 +591,8 @@ class SimpleFunctionMetadata : public ISimpleFunctionMetadata {
     builder.returnType(analysis.outputType);
     int32_t position = 0;
     for (const auto& arg : analysis.argsTypes) {
-      if (sizeof...(TArgs) > 0 && ConstantChecker::isConstant[position++]) {
+      if (ConstantChecker::getSize() > 0 &&
+          ConstantChecker::isConstant[position++]) {
         builder.constantArgumentType(arg);
       } else {
         builder.argumentType(arg);
diff --git a/velox/type/SimpleFunctionApi.h b/velox/type/SimpleFunctionApi.h
index 70848cfc7953..fa1b0b44837e 100644
--- a/velox/type/SimpleFunctionApi.h
+++ b/velox/type/SimpleFunctionApi.h
@@ -233,6 +233,10 @@ template <typename... TArgs>
 struct ConstantChecker {
   static constexpr bool isConstant[sizeof...(TArgs)] = {
       isConstantType<TArgs>::value...};
+
+  static constexpr size_t getSize() {
+    return sizeof...(TArgs);
+  }
 };
 
 /// CppToType templates for types introduced above.