diff --git a/src/pixels.c b/src/pixels.c
index 0d49b91..439fc8e 100644
--- a/src/pixels.c
+++ b/src/pixels.c
@@ -84,7 +84,7 @@ bool fourcc_to_pixman_fmt(pixman_format_code_t* dst, uint32_t src)
 	X(B,G,R,,5,6,5,);
 
 	/* These are incompatible on big endian */
-#if __BYTE_ORDER == __LITTLE_ENDIAN
+#if __BYTE_ORDER__ == __LITTLE_ENDIAN__
 	X(A,R,G,B,1,5,5,5);
 	X(A,B,G,R,1,5,5,5);
 	X(X,R,G,B,1,5,5,5);