diff --git a/tools/mkimage.h b/tools/mkimage.h
index f5ca65e2ed..d92a3ff811 100644
--- a/tools/mkimage.h
+++ b/tools/mkimage.h
@@ -17,6 +17,7 @@
 #include <sys/stat.h>
 #include <time.h>
 #include <unistd.h>
+#include <limits.h>
 #include <u-boot/sha1.h>
 #include "fdt_host.h"
 #include "imagetool.h"
@@ -44,7 +45,7 @@ static inline ulong map_to_sysmem(void *ptr)
 #define ALLOC_CACHE_ALIGN_BUFFER(type, name, size) type name[size]
 
 #define MKIMAGE_TMPFILE_SUFFIX		".tmp"
-#define MKIMAGE_MAX_TMPFILE_LEN		256
+#define MKIMAGE_MAX_TMPFILE_LEN		PATH_MAX
 #define MKIMAGE_DEFAULT_DTC_OPTIONS	"-I dts -O dtb -p 500"
 #define MKIMAGE_MAX_DTC_CMDLINE_LEN	2 * MKIMAGE_MAX_TMPFILE_LEN + 35