diff --git a/libavcodec/rka.c b/libavcodec/rka.c
index 994c563ffd..7452acf27f 100644
--- a/libavcodec/rka.c
+++ b/libavcodec/rka.c
@@ -691,7 +691,7 @@ static int decode_filter(RKAContext *s, ChContext *ctx, ACoder *ac, int off, uns
     else
         split = size >> 4;
 
-    if (size <= 0)
+    if (size <= 1)
         return 0;
 
     for (int x = 0; x < size;) {