diff --git a/src/sfizz/Defaults.h b/src/sfizz/Defaults.h
index 65e7215f..2db5216c 100644
--- a/src/sfizz/Defaults.h
+++ b/src/sfizz/Defaults.h
@@ -77,7 +77,7 @@ struct OpcodeSpec
     template<class U=T>
     typename std::enable_if<std::is_arithmetic<U>::value, U>::type normalizeInput(U input) const
     {
-        constexpr auto needsOperation {
+        constexpr int needsOperation {
             kNormalizePercent |
             kNormalizeMidi |
             kNormalizeBend |