diff --git a/compiler/arm/aoptcpu.pas b/compiler/arm/aoptcpu.pas
index 4a29f24a33..6ec6e435b4 100644
--- a/compiler/arm/aoptcpu.pas
+++ b/compiler/arm/aoptcpu.pas
@@ -25,8 +25,8 @@ Unit aoptcpu;
 
 {$i fpcdefs.inc}
 
-{$define DEBUG_PREREGSCHEDULER}
-{$define DEBUG_AOPTCPU}
+{ $define DEBUG_PREREGSCHEDULER}
+{ $define DEBUG_AOPTCPU}
 
 Interface