diff --git a/board/cm41xx/cm41xx.c b/board/cm41xx/cm41xx.c
index 02d05afef6e824b618e872670a3af75c7e6723e2..9a6d89fdc6d18b765dd8d961be49cae898993ec8 100644
--- a/board/cm41xx/cm41xx.c
+++ b/board/cm41xx/cm41xx.c
@@ -46,8 +46,8 @@ DECLARE_GLOBAL_DATA_PTR;
  */
 int env_flash_cmdline (void)
 {
-	unsigned char *sp = (unsigned char *) 0x0201c020;
-	unsigned char *ep;
+	char *sp = (char *) 0x0201c020;
+	char *ep;
 	int len;
 
 	/* Check if "erase" push button is depressed */