diff --git a/libavfilter/af_biquads.c b/libavfilter/af_biquads.c
index 10de28d8bc..91662c4f5a 100644
--- a/libavfilter/af_biquads.c
+++ b/libavfilter/af_biquads.c
@@ -98,7 +98,7 @@ typedef struct {
     const AVClass *class;
 
     enum FilterType filter_type;
-    enum WidthType width_type;
+    int width_type;
     int poles;
     int csg;