diff --git a/audio/format.h b/audio/format.h
index 19118a7b59..6fcf923624 100644
--- a/audio/format.h
+++ b/audio/format.h
@@ -112,7 +112,7 @@ enum af_format {
     // Planar variants
     AF_FORMAT_U8P       = (AF_INTP|AF_FORMAT_US|AF_FORMAT_8BIT|AF_FORMAT_NE),
     AF_FORMAT_S16P      = (AF_INTP|AF_FORMAT_SI|AF_FORMAT_16BIT|AF_FORMAT_NE),
-    AF_FORMAT_S32P      = (AF_INTP|AF_FORMAT_US|AF_FORMAT_32BIT|AF_FORMAT_NE),
+    AF_FORMAT_S32P      = (AF_INTP|AF_FORMAT_SI|AF_FORMAT_32BIT|AF_FORMAT_NE),
     AF_FORMAT_FLOATP    = (AF_FLTP|AF_FORMAT_32BIT|AF_FORMAT_NE),
     AF_FORMAT_DOUBLEP   = (AF_FLTP|AF_FORMAT_64BIT|AF_FORMAT_NE),