diff --git a/src/libsync/filesystem.h b/src/libsync/filesystem.h
index 461028b15c..602f74bb7f 100644
--- a/src/libsync/filesystem.h
+++ b/src/libsync/filesystem.h
@@ -82,7 +82,7 @@ namespace FileSystem {
     /**
      * @brief Like !fileChanged() but with verbose logging if the file *did* change.
      */
-    bool verifyFileUnchanged(const QString &fileName,
+    bool OWNCLOUDSYNC_EXPORT verifyFileUnchanged(const QString &fileName,
         qint64 previousSize,
         time_t previousMtime);