diff --git a/mi/mi.h b/mi/mi.h
index 10432a71a..d0c50a35d 100644
--- a/mi/mi.h
+++ b/mi/mi.h
@@ -156,11 +156,6 @@ extern _X_EXPORT void mieqAddCallbackOnDrained(CallbackProcPtr callback,
 extern _X_EXPORT void mieqRemoveCallbackOnDrained(CallbackProcPtr callback,
                                                   void *param);
 
-extern DeviceIntPtr CopyGetMasterEvent(DeviceIntPtr /* sdev */ ,
-                                       InternalEvent * /* original */ ,
-                                       InternalEvent *  /* copy */
-    );
-
 /**
  * Custom input event handler. If you need to process input events in some
  * other way than the default path, register an input event handler for the
diff --git a/mi/mieq.c b/mi/mieq.c
index 0d41324ee..bca6f8be7 100644
--- a/mi/mieq.c
+++ b/mi/mieq.c
@@ -385,7 +385,7 @@ FixUpEventForMaster(DeviceIntPtr mdev, DeviceIntPtr sdev,
  * @param copy The event after being copied
  * @return The master device or NULL if the device is a floating slave.
  */
-DeviceIntPtr
+static DeviceIntPtr
 CopyGetMasterEvent(DeviceIntPtr sdev,
                    InternalEvent *original, InternalEvent *copy)
 {