diff --git a/src/core/video_thread.cpp b/src/core/video_thread.cpp
index 242a47a4d..0a86e3dba 100644
--- a/src/core/video_thread.cpp
+++ b/src/core/video_thread.cpp
@@ -1151,6 +1151,8 @@ void VideoThread::UpdateSettingsOnThread(GPUSettings&& new_settings)
 
 void VideoThread::RunOnThread(AsyncCallType func)
 {
+  DebugAssert(!VideoThread::IsOnThread());
+
   if (!s_state.use_thread) [[unlikely]]
   {
     func();
@@ -1164,6 +1166,8 @@ void VideoThread::RunOnThread(AsyncCallType func)
 
 void VideoThread::RunOnThreadAndSync(AsyncCallType func)
 {
+  DebugAssert(!VideoThread::IsOnThread());
+
   if (!s_state.use_thread) [[unlikely]]
   {
     func();
@@ -1177,6 +1181,8 @@ void VideoThread::RunOnThreadAndSync(AsyncCallType func)
 
 std::pair<VideoThreadCommand*, void*> VideoThread::BeginASyncBufferCall(AsyncBufferCallType func, u32 buffer_size)
 {
+  DebugAssert(!VideoThread::IsOnThread());
+
   // this is less than optimal, but it's only used for input osd updates currently, so whatever
   VideoThreadAsyncBufferCallCommand* const cmd = AllocateCommand<VideoThreadAsyncBufferCallCommand>(
     sizeof(VideoThreadAsyncBufferCallCommand) + buffer_size, VideoThreadCommandType::AsyncBufferCall, func);
@@ -1186,6 +1192,8 @@ std::pair<VideoThreadCommand*, void*> VideoThread::BeginASyncBufferCall(AsyncBuf
 
 void VideoThread::EndASyncBufferCall(VideoThreadCommand* cmd)
 {
+  DebugAssert(!VideoThread::IsOnThread());
+
   if (!s_state.use_thread) [[unlikely]]
   {
     VideoThreadAsyncBufferCallCommand* const acmd = static_cast<VideoThreadAsyncBufferCallCommand*>(cmd);