diff --git a/randr/randrstr.h b/randr/randrstr.h
index c051f420c..b920dcbc8 100644
--- a/randr/randrstr.h
+++ b/randr/randrstr.h
@@ -638,9 +638,6 @@ extern _X_EXPORT Bool
 RROutputSetModes(RROutputPtr output,
                  RRModePtr * modes, int numModes, int numPreferred);
 
-extern _X_EXPORT int
- RROutputAddUserMode(RROutputPtr output, RRModePtr mode);
-
 extern _X_EXPORT int
  RROutputDeleteUserMode(RROutputPtr output, RRModePtr mode);
 
diff --git a/randr/randrstr_priv.h b/randr/randrstr_priv.h
index a50a6e2ea..3bac26890 100644
--- a/randr/randrstr_priv.h
+++ b/randr/randrstr_priv.h
@@ -315,4 +315,13 @@ Bool RRModeInit(void);
  */
 void RRModeInitErrorValue(void);
 
+/*
+ * Add user-given mode to output
+ *
+ * @param output  the output where to which a mode should be added
+ * @param mode    the mode to add to the output
+ * @return X error code
+ */
+int RROutputAddUserMode(RROutputPtr output, RRModePtr mode);
+
 #endif /* _XSERVER_RANDRSTR_PRIV_H_ */