diff --git a/libavfilter/af_volume.h b/libavfilter/af_volume.h
index 53a328e352..aff75267fe 100644
--- a/libavfilter/af_volume.h
+++ b/libavfilter/af_volume.h
@@ -68,13 +68,13 @@ enum ReplayGainType {
 typedef struct VolumeContext {
     const AVClass *class;
     AVFloatDSPContext *fdsp;
-    enum PrecisionType precision;
-    enum EvalMode eval_mode;
+    int precision;
+    int eval_mode;
     const char *volume_expr;
     AVExpr *volume_pexpr;
     double var_values[VAR_VARS_NB];
 
-    enum ReplayGainType replaygain;
+    int replaygain;
     double replaygain_preamp;
     int    replaygain_noclip;
     double volume;