diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index 68e0f2c215..b18c0cb31e 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -277,7 +277,7 @@ const
 #endif
 AVFilter *avfilter_get_by_name(const char *name)
 {
-    AVFilter *f = NULL;
+    const AVFilter *f = NULL;
 
     if (!name)
         return NULL;
@@ -343,7 +343,7 @@ static void *filter_child_next(void *obj, void *prev)
 
 static const AVClass *filter_child_class_next(const AVClass *prev)
 {
-    AVFilter *f = NULL;
+    const AVFilter *f = NULL;
 
     while (prev && (f = avfilter_next(f)))
         if (f->priv_class == prev)