1 files changed, 1 insertions, 1 deletions
diff --git a/libavutil/eval.c b/libavutil/eval.c
index 72f976ca4b..31e9ebbc9c 100644
--- a/libavutil/eval.c
+++ b/libavutil/eval.c
@@ -231,7 +231,7 @@ static int parse_primary(AVExpr **e, Parser *p)
     }
 
     p->s= strchr(p->s, '(');
-    if (p->s==NULL) {
+    if (!p->s) {
         av_log(p, AV_LOG_ERROR, "Undefined constant or missing '(' in '%s'\n", s0);
         p->s= next;
         av_expr_free(d);