diff --git a/src/Surface.zig b/src/Surface.zig
index dfc3a50ea..a040b1211 100644
--- a/src/Surface.zig
+++ b/src/Surface.zig
@@ -3821,6 +3821,8 @@ pub fn mouseButtonCallback(
         // clicked link will swallow the event.
         if (self.mouse.over_link) {
             const pos = try self.rt_surface.getCursorPos();
+            self.renderer_state.mutex.lock();
+            defer self.renderer_state.mutex.unlock();
             if (self.processLinks(pos)) |processed| {
                 if (processed) return true;
             } else |err| {