diff --git a/desktop/wmbackground/wmbackground.SlackBuild b/desktop/wmbackground/wmbackground.SlackBuild
index 8afdf345e4..1fb3ca54cd 100644
--- a/desktop/wmbackground/wmbackground.SlackBuild
+++ b/desktop/wmbackground/wmbackground.SlackBuild
@@ -54,7 +54,7 @@ find -L . \
 
 cd wmbackground
   make \
-    FLAGS="$SLKCFLAGS"
+    CC="gcc -fgnu89-inline $SLKCFLAGS"
 
 # Copy executable to the correct location
 mkdir -p $PKG/usr/bin