diff --git a/compat/getprogname.c b/compat/getprogname.c
index a243233..ea7c2a3 100644
--- a/compat/getprogname.c
+++ b/compat/getprogname.c
@@ -16,7 +16,7 @@
 
 #include "../config.h"
 
-#ifdef HAVE_PROGRAM_INVOCATION_SHORT_NAME
+#if HAVE_PROGRAM_INVOCATION_SHORT_NAME
 
 #include <errno.h>