diff --git a/cmds/dumpstate/DumpstateService.cpp b/cmds/dumpstate/DumpstateService.cpp
index a0b9cbb..1824943 100644
--- a/cmds/dumpstate/DumpstateService.cpp
+++ b/cmds/dumpstate/DumpstateService.cpp
@@ -148,14 +148,13 @@
 }
 
 binder::Status DumpstateService::cancelBugreport() {
-    // This is a no-op since the cancellation is done from java side via setting sys properties.
-    // See BugreportManagerServiceImpl.
-    // TODO(b/111441001): maybe make native and java sides use different binder interface
-    // to avoid these annoyances.
+    std::lock_guard<std::mutex> lock(lock_);
+    ds_->Cancel();
     return binder::Status::ok();
 }
 
 status_t DumpstateService::dump(int fd, const Vector<String16>&) {
+    std::lock_guard<std::mutex> lock(lock_);
     if (ds_ == nullptr) {
         dprintf(fd, "Bugreport not in progress yet");
         return NO_ERROR;