diff --git a/libavfilter/af_amerge.c b/libavfilter/af_amerge.c
index 2b4edb09ff..4a8c6d5bd0 100644
--- a/libavfilter/af_amerge.c
+++ b/libavfilter/af_amerge.c
@@ -52,7 +52,7 @@ typedef struct {
 
 static const AVOption amerge_options[] = {
     { "inputs", "specify the number of inputs", OFFSET(nb_inputs),
-      AV_OPT_TYPE_INT, { .i64 = 2 }, 2, SWR_CH_MAX, FLAGS },
+      AV_OPT_TYPE_INT, { .i64 = 2 }, 1, SWR_CH_MAX, FLAGS },
     { NULL }
 };