diff --git a/lib/libc/gen/setprogname.c b/lib/libc/gen/setprogname.c
index 2ddceef9cf9..8a04211b06a 100644
--- a/lib/libc/gen/setprogname.c
+++ b/lib/libc/gen/setprogname.c
@@ -14,5 +14,5 @@ setprogname(const char *progname)
 	const char *p;
 
 	p = strrchr(progname, '/');
-	__progname = p ? p + 1 : progname;
+	__progname = p != NULL ? p + 1 : progname;
 }