diff --git a/Utilities/Thread.cpp b/Utilities/Thread.cpp
index a74fbba6c9..a74f2daf73 100644
--- a/Utilities/Thread.cpp
+++ b/Utilities/Thread.cpp
@@ -2987,3 +2987,8 @@ u64 thread_ctrl::get_tid()
 	return reinterpret_cast<u64>(pthread_self());
 #endif
 }
+
+bool thread_ctrl::is_main()
+{
+	return get_tid() == utils::main_tid;
+}
diff --git a/Utilities/Thread.h b/Utilities/Thread.h
index abcc0bc8ff..b10351d76b 100644
--- a/Utilities/Thread.h
+++ b/Utilities/Thread.h
@@ -342,6 +342,9 @@ public:
 	// Get thread ID (works for all threads)
 	static u64 get_tid();
 
+	// Check whether current thread is main thread (usually Qt GUI)
+	static bool is_main();
+
 private:
 	// Miscellaneous
 	static const u64 process_affinity_mask;
diff --git a/rpcs3/main.cpp b/rpcs3/main.cpp
index 12b89347f5..b1e487074c 100644
--- a/rpcs3/main.cpp
+++ b/rpcs3/main.cpp
@@ -377,6 +377,8 @@ int main(int argc, char** argv)
 	}
 #endif
 
+	ensure(thread_ctrl::is_main());
+
 	// Initialize TSC freq (in case it isn't)
 	static_cast<void>(utils::get_tsc_freq());