diff --git a/src/libImaging/Convert.c b/src/libImaging/Convert.c
index 5cc39cd0019..2654fd40d64 100644
--- a/src/libImaging/Convert.c
+++ b/src/libImaging/Convert.c
@@ -510,7 +510,7 @@ rgbT2rgba(UINT8 *out, int xsize, int r, int g, int b) {
     UINT32 trns = ((r & 0xff) << 24) | ((g & 0xff) << 16) | ((b & 0xff) << 8) | 0xff;
     UINT32 repl = trns & 0xffffff00;
 #else
-    UINT32 trns = (0xffU << 24) | ((b & 0xff) << 16) | ((g & 0xff) << 8) | (r & 0xff);
+    UINT32 trns = (0xff << 24) | ((b & 0xff) << 16) | ((g & 0xff) << 8) | (r & 0xff);
     UINT32 repl = trns & 0x00ffffff;
 #endif