diff --git a/libavfilter/vf_gblur.c b/libavfilter/vf_gblur.c
index a775f8cbf8..fd664db057 100644
--- a/libavfilter/vf_gblur.c
+++ b/libavfilter/vf_gblur.c
@@ -249,11 +249,21 @@ void ff_gblur_init(GBlurContext *s)
         ff_gblur_init_x86(s);
 }
 
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    GBlurContext *s = ctx->priv;
+
+    av_freep(&s->buffer);
+    av_freep(&s->localbuf);
+}
+
 static int config_input(AVFilterLink *inlink)
 {
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
     GBlurContext *s = inlink->dst->priv;
 
+    uninit(inlink->dst);
+
     s->depth = desc->comp[0].depth;
     s->flt = !!(desc->flags & AV_PIX_FMT_FLAG_FLOAT);
     s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
@@ -379,14 +389,6 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
     return ff_filter_frame(outlink, out);
 }
 
-static av_cold void uninit(AVFilterContext *ctx)
-{
-    GBlurContext *s = ctx->priv;
-
-    av_freep(&s->buffer);
-    av_freep(&s->localbuf);
-}
-
 static const AVFilterPad gblur_inputs[] = {
     {
         .name         = "default",