diff --git a/funcs/sfx1.c b/funcs/sfx1.c
index e8dda3b7..c474123a 100644
--- a/funcs/sfx1.c
+++ b/funcs/sfx1.c
@@ -70,7 +70,7 @@ for (idx=0; idx<sz; idx++) {
 int fimg_highlight_color(FloatImg *src, FloatImg *dst, char color, float fval)
 {
 
-#ifdef DEBUG_LEVEL
+#if DEBUG_LEVEL
 fprintf(stderr, ">>> %s ( %p %p [%c] %f )\n", __func__,
 			src, dst, color, fval);
 #endif