diff --git a/libavfilter/af_aiir.c b/libavfilter/af_aiir.c
index 6ff48e45aa..f4485b0194 100644
--- a/libavfilter/af_aiir.c
+++ b/libavfilter/af_aiir.c
@@ -477,6 +477,8 @@ static av_cold void uninit(AVFilterContext *ctx)
     }
     av_freep(&s->b);
 
+    av_freep(&s->g);
+
     av_freep(&s->input);
     av_freep(&s->output);