Index: subversion/libsvn_repos/hooks.c
===================================================================
--- subversion/libsvn_repos/hooks.c	(revision 31672)
+++ subversion/libsvn_repos/hooks.c	(working copy)
@@ -576,7 +576,7 @@
         }
       else
         {
-          capabilities_string = "";
+          strcpy(capabilities_string, "");
         }
 
       args[0] = hook;