diff --git a/common/cmd_mmc.c b/common/cmd_mmc.c
index 32fe49b775e0570737037f27d7f6d97a3e61fffb..0e3393b5f44b9d5c7f4b4869658101e1574cd646 100644
--- a/common/cmd_mmc.c
+++ b/common/cmd_mmc.c
@@ -26,7 +26,7 @@
 #include <mmc.h>
 
 #ifndef CONFIG_GENERIC_MMC
-int curr_device = -1;
+static int curr_device = -1;
 
 int do_mmc (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 {