diff --git a/Xi/setmmap.c b/Xi/setmmap.c
index 1c8df53c2..84956409f 100644
--- a/Xi/setmmap.c
+++ b/Xi/setmmap.c
@@ -103,15 +103,10 @@ ProcXSetDeviceModifierMapping(ClientPtr client)
         rep.success = ret;
         WriteReplyToClient(client, sizeof(xSetDeviceModifierMappingReply),
                            &rep);
-    }
-    else if (ret == -1) {
-        return BadValue;
-    }
-    else {
-        return ret;
+        return Success;
     }
 
-    return Success;
+    return ret;
 }
 
 /***********************************************************************
diff --git a/dix/devices.c b/dix/devices.c
index c59ea8b3b..82cdc3182 100644
--- a/dix/devices.c
+++ b/dix/devices.c
@@ -1771,7 +1771,7 @@ ProcSetModifierMapping(ClientPtr client)
 
     rc = change_modmap(client, PickKeyboard(client), (KeyCode *) &stuff[1],
                        stuff->numKeyPerModifier);
-    if (rc == MappingFailed || rc == -1)
+    if (rc == MappingFailed)
         return BadValue;
     if (rc != MappingSuccess && rc != MappingFailed && rc != MappingBusy)
         return rc;
diff --git a/dix/inpututils.c b/dix/inpututils.c
index 25a309067..551df7774 100644
--- a/dix/inpututils.c
+++ b/dix/inpututils.c
@@ -150,7 +150,7 @@ check_modmap_change(ClientPtr client, DeviceIntPtr dev, KeyCode *modmap)
          * keycode range. */
         if (i < xkb->min_key_code || i > xkb->max_key_code) {
             client->errorValue = i;
-            return -1;
+            return BadValue;
         }
 
         /* None of the new modifiers may be down while we change the