diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 31aac2bdbf15c418bcac4e24f58a1621051f6152..698277a178861ec5263572ca3c232f0f8f79298b 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2017-01-02  Jeff Law  <law@redhat.com>
+
+	* config/darwin-driver.c (darwin_driver_init): Const-correctness
+	fixes for first_period and second_period variables.
+
 2017-01-02  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/78967
diff --git a/gcc/config/darwin-driver.c b/gcc/config/darwin-driver.c
index 0c4f0cd1b0d37bf9a12fbb0666fccc0a4e4dcc32..e3ed79d14dd115a216e0a6ed56c0e348228936d6 100644
--- a/gcc/config/darwin-driver.c
+++ b/gcc/config/darwin-driver.c
@@ -299,10 +299,10 @@ darwin_driver_init (unsigned int *decoded_options_count,
   if (vers_string != NULL)
     {
       char *asm_major = NULL;
-      char *first_period = strchr(vers_string, '.');
+      const char *first_period = strchr(vers_string, '.');
       if (first_period != NULL)
 	{
-	  char *second_period = strchr(first_period+1, '.');
+	  const char *second_period = strchr(first_period+1, '.');
 	  if (second_period  != NULL)
 	    asm_major = xstrndup (vers_string, second_period-vers_string);
 	  else