diff --git a/subprojects/gst-plugins-bad/gst/siren/encoder.c b/subprojects/gst-plugins-bad/gst/siren/encoder.c
index 8bb340f647..8db808aeb9 100644
--- a/subprojects/gst-plugins-bad/gst/siren/encoder.c
+++ b/subprojects/gst-plugins-bad/gst/siren/encoder.c
@@ -210,7 +210,7 @@ Siren7_EncodeFrame (SirenEncoder encoder, unsigned char *DataIn,
   }
 
   if (checksum_bits > 0) {
-    BufferOut[idx - 1] &= (-1 << checksum_bits);
+    BufferOut[idx - 1] &= (((unsigned short) -1) << checksum_bits);
     sum = 0;
     idx = 0;
     do {