diff --git a/drivers/scsi/NCR53c406a.c b/drivers/scsi/NCR53c406a.c
index 79ae73b23680..e1f2246ee7cd 100644
--- a/drivers/scsi/NCR53c406a.c
+++ b/drivers/scsi/NCR53c406a.c
@@ -62,7 +62,7 @@
 
 #define SYNC_MODE 0		/* Synchronous transfer mode */
 
-#if DEBUG
+#ifdef DEBUG
 #undef NCR53C406A_DEBUG
 #define NCR53C406A_DEBUG 1
 #endif