diff --git a/Userland/Libraries/LibRegex/RegexDebug.h b/Userland/Libraries/LibRegex/RegexDebug.h
index 19c028b9c7..1f53217a68 100644
--- a/Userland/Libraries/LibRegex/RegexDebug.h
+++ b/Userland/Libraries/LibRegex/RegexDebug.h
@@ -30,7 +30,7 @@
 #include "LibRegex/RegexMatcher.h"
 #include <AK/Debug.h>
 
-#if !REGEX_DEBUG
+#if REGEX_DEBUG
 
 namespace regex {