diff --git a/include/xkbsrv.h b/include/xkbsrv.h
index 239b7a180..c0cd50175 100644
--- a/include/xkbsrv.h
+++ b/include/xkbsrv.h
@@ -919,7 +919,7 @@ extern Bool XkbCopyKeymap(
         XkbDescPtr              /* dst */,
         XkbDescPtr              /* src */);
 
-extern Bool XkbCopyDeviceKeymap(
+extern _X_EXPORT Bool XkbCopyDeviceKeymap(
         DeviceIntPtr            /* dst */,
         DeviceIntPtr            /* src */);