diff --git a/scripts/dtc/libfdt/fdt_rw.c b/scripts/dtc/libfdt/fdt_rw.c
index 2e49855d7cf8..3759ae4d064a 100644
--- a/scripts/dtc/libfdt/fdt_rw.c
+++ b/scripts/dtc/libfdt/fdt_rw.c
@@ -407,7 +407,7 @@ int fdt_del_node(void *fdt, int nodeoffset)
 static void fdt_packblocks_(const char *old, char *new,
 			    int mem_rsv_size, int struct_size)
 {
-	int mem_rsv_off, struct_off, strings_off;
+	uint32_t mem_rsv_off, struct_off, strings_off;
 
 	mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8);
 	struct_off = mem_rsv_off + mem_rsv_size;