diff --git a/libavfilter/af_pan.c b/libavfilter/af_pan.c
index a477bde460..e54f715147 100644
--- a/libavfilter/af_pan.c
+++ b/libavfilter/af_pan.c
@@ -166,6 +166,7 @@ static av_cold int init(AVFilterContext *ctx)
             goto fail;
         }
         /* gains */
+        sign = 1;
         while (1) {
             gain = 1;
             if (sscanf(arg, "%lf%n *%n", &gain, &len, &len))