diff --git a/reactos/boot/environ/lib/mm/i386/mmx86.c b/reactos/boot/environ/lib/mm/i386/mmx86.c
index 4125715ec4e..e61aaaf2b9e 100644
--- a/reactos/boot/environ/lib/mm/i386/mmx86.c
+++ b/reactos/boot/environ/lib/mm/i386/mmx86.c
@@ -9,6 +9,7 @@
 /* INCLUDES ******************************************************************/
 
 #include "bl.h"
+#include "bcd.h"
 
 /* DATA VARIABLES ************************************************************/