diff --git a/package/mtd/Makefile b/package/mtd/Makefile
index 9438b96fd..332ce3034 100644
--- a/package/mtd/Makefile
+++ b/package/mtd/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 include $(INCLUDE_DIR)/kernel.mk
 
 PKG_NAME:=mtd
-PKG_RELEASE:=12
+PKG_RELEASE:=13
 
 PKG_BUILD_DIR := $(KERNEL_BUILD_DIR)/$(PKG_NAME)
 STAMP_PREPARED := $(STAMP_PREPARED)_$(call confvar,CONFIG_MTD_REDBOOT_PARTS)
diff --git a/package/mtd/src/fis.c b/package/mtd/src/fis.c
index b285d24db..559ca9506 100644
--- a/package/mtd/src/fis.c
+++ b/package/mtd/src/fis.c
@@ -77,7 +77,7 @@ fis_open(void)
 		goto error;
 
 	fis_erasesize = erasesize;
-	desc = mmap(NULL, erasesize, PROT_READ|PROT_WRITE, MAP_SHARED, fis_fd, 0);
+	desc = mmap(NULL, erasesize, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_LOCKED, fis_fd, 0);
 	if (desc == MAP_FAILED)
 		goto error;