diff --git a/ntfsprogs/mkntfs.c b/ntfsprogs/mkntfs.c
index 2f2571fd..1c8fd65d 100644
--- a/ntfsprogs/mkntfs.c
+++ b/ntfsprogs/mkntfs.c
@@ -84,7 +84,7 @@
 #endif
 #include <limits.h>
 
-#if defined(__LINUX__) && defined(_IO) && !defined(BLKSSZGET)
+#if defined(linux) && defined(_IO) && !defined(BLKSSZGET)
 #	define BLKSSZGET _IO(0x12,104) /* Get device sector size in bytse. */
 #endif