2 files changed, 6 insertions, 3 deletions

diff --git a/src/video_core/gpu.cpp b/src/video_core/gpu.cpp
index efea23bf2..cdb2f804e 100644
--- a/src/video_core/gpu.cpp
+++ b/src/video_core/gpu.cpp
@@ -97,15 +97,18 @@ void GPU::RegisterSyncptInterrupt(const u32 syncpoint_id, const u32 value) {
     syncpt_interrupts[syncpoint_id].emplace_back(value);
 }
 
-void GPU::CancelSyncptInterrupt(const u32 syncpoint_id, const u32 value) {
+bool GPU::CancelSyncptInterrupt(const u32 syncpoint_id, const u32 value) {
+    sync_mutex.lock();
     auto it = syncpt_interrupts[syncpoint_id].begin();
     while (it != syncpt_interrupts[syncpoint_id].end()) {
         if (value == *it) {
             it = syncpt_interrupts[syncpoint_id].erase(it);
-            return;
+            return true;
         }
         it++;
     }
+    return false;
+    sync_mutex.unlock();
 }
 
 u32 RenderTargetBytesPerPixel(RenderTargetFormat format) {
diff --git a/src/video_core/gpu.h b/src/video_core/gpu.h
index 9bd618941..94afc91f8 100644
--- a/src/video_core/gpu.h
+++ b/src/video_core/gpu.h
@@ -174,7 +174,7 @@ public:
 
     void RegisterSyncptInterrupt(const u32 syncpoint_id, const u32 value);
 
-    void CancelSyncptInterrupt(const u32 syncpoint_id, const u32 value);
+    bool CancelSyncptInterrupt(const u32 syncpoint_id, const u32 value);
 
     void Guard(bool guard_set) {
         if (guard_set) {