diff --git a/base/third_party/dmg_fp/dtoa.cc b/base/third_party/dmg_fp/dtoa.cc
index d7e6826..be560bc 100644
--- a/base/third_party/dmg_fp/dtoa.cc
+++ b/base/third_party/dmg_fp/dtoa.cc
@@ -1533,7 +1533,7 @@ hexdig_init(void)	/* Use of hexdig_init omitted 20121220 to avoid a */
 	htinit(hexdig, USC "ABCDEF", 0x10 + 10);
 	}
 #else
-static unsigned char hexdig[256] = {
+static const unsigned char hexdig[256] = {
 	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,