diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b907c6622d54..de8a650f2604 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2016-10-14  Nathan Sidwell  <nathan@acm.org>
+
+	* gcov-io.c (gcov_open): Deconstify 'mode'.
+
 2016-10-14  Martin Liska  <mliska@suse.cz>
 
 	* fold-const.c (c_getstr): Support of properly \0-terminated
diff --git a/gcc/gcov-io.c b/gcc/gcov-io.c
index 1720d91d7862..731c2cf07dfe 100644
--- a/gcc/gcov-io.c
+++ b/gcc/gcov-io.c
@@ -127,7 +127,7 @@ gcov_open (const char *name, int mode)
 #endif
 {
 #if IN_LIBGCOV
-  const int mode = 0;
+  int mode = 0;
 #endif
 #if GCOV_LOCKED
   struct flock s_flock;