diff --git a/include/mbgl/util/event.hpp b/include/mbgl/util/event.hpp
index 7ad3d914e..5fe0baae3 100644
--- a/include/mbgl/util/event.hpp
+++ b/include/mbgl/util/event.hpp
@@ -40,7 +40,7 @@ struct EventPermutation {
 };
 
 constexpr EventSeverity disabledEventSeverities[] = {
-#ifdef NDEBUG
+#ifndef NDEBUG
     EventSeverity(-1) // Avoid zero size array
 #else
     EventSeverity::Debug