diff --git a/gcc/config/host-darwin.cc b/gcc/config/host-darwin.cc
index d4289aeb4d38..01554d565f97 100644
--- a/gcc/config/host-darwin.cc
+++ b/gcc/config/host-darwin.cc
@@ -104,7 +104,7 @@ darwin_gt_pch_get_address (size_t sz, int fd)
      space.  */
   if (addr == (void *) MAP_FAILED)
     {
-      error ("PCH memory not available %m");
+      error ("PCH memory is not available: %m");
       return NULL;
     }