diff --git a/libavfilter/af_pan.c b/libavfilter/af_pan.c
index a29d12d2b1..11034fb257 100644
--- a/libavfilter/af_pan.c
+++ b/libavfilter/af_pan.c
@@ -186,7 +186,7 @@ static av_cold int init(AVFilterContext *ctx)
         sign = 1;
         while (1) {
             gain = 1;
-            if (sscanf(arg, "%lf%n *%n", &gain, &len, &len))
+            if (sscanf(arg, "%lf%n *%n", &gain, &len, &len) >= 1)
                 arg += len;
             if (parse_channel_name(&arg, &in_ch_id, &named)){
                 av_log(ctx, AV_LOG_ERROR,