diff --git a/src/preferences/sounds/Jamfile b/src/preferences/sounds/Jamfile
index 95099c65be..b1e2cf5188 100644
--- a/src/preferences/sounds/Jamfile
+++ b/src/preferences/sounds/Jamfile
@@ -2,7 +2,7 @@ SubDir HAIKU_TOP src preferences sounds ;
 
 SetSubDirSupportedPlatformsBeOSCompatible ;
 
-if $(TARGET_PLATFORM) != haiku {
+if $(TARGET_PLATFORM) = haiku {
         SubDirC++Flags -fmultiple-symbol-spaces ;
 }