diff --git a/modules/csync_smb.c b/modules/csync_smb.c
index 2edc630..2b81d72 100644
--- a/modules/csync_smb.c
+++ b/modules/csync_smb.c
@@ -49,7 +49,6 @@ static void get_auth_data_with_context_fn(SMBCCTX *smb_ctx,
     char *pw, int pwlen)
 {
   static int try_krb5 = 1;
-  char *h;
 
   (void) smb_ctx;
   (void) shr;
@@ -73,7 +72,7 @@ static void get_auth_data_with_context_fn(SMBCCTX *smb_ctx,
   }
 
   /* check for an existing user */
-  h = smbc_getUser(smb_ctx);
+  const char* h = smbc_getUser(smb_ctx);
   if (h != NULL) {
     /* The username is known from the url. */
     DEBUG_SMB(("csync_smb - have username from url: %s\n", h));