diff --git a/randr/randrstr.h b/randr/randrstr.h
index dffe381dc..1f8ebbf07 100644
--- a/randr/randrstr.h
+++ b/randr/randrstr.h
@@ -609,11 +609,6 @@ extern _X_EXPORT RRModePtr RRModeGet(xRRModeInfo * modeInfo, const char *name);
 extern _X_EXPORT void
  RRModeDestroy(RRModePtr mode);
 
-/*
- * Return a list of modes that are valid for some output in pScreen
- */
-extern _X_EXPORT RRModePtr *RRModesForScreen(ScreenPtr pScreen, int *num_ret);
-
 /*
  * Initialize mode type
  */
diff --git a/randr/randrstr_priv.h b/randr/randrstr_priv.h
index 931369d1d..595fd536b 100644
--- a/randr/randrstr_priv.h
+++ b/randr/randrstr_priv.h
@@ -289,4 +289,16 @@ Bool RRCrtcIsLeased(RRCrtcPtr crtc);
  */
 Bool RROutputIsLeased(RROutputPtr output);
 
+/*
+ * Query a list of modes valid for some output in given screen
+ *
+ + The list is allocated by that function and must be freed by caller.
+ * `num_ret` holds the number of entries (the buffer might be larger)
+ *
+ * @param pScreen the screen to query
+ * @param num_ret return buffer for number of returned modes
+ * @return pointer to array of RRModePtr's
+ */
+RRModePtr *RRModesForScreen(ScreenPtr pScreen, int *num_ret);
+
 #endif /* _XSERVER_RANDRSTR_PRIV_H_ */