diff --git a/Source/dthread.cpp b/Source/dthread.cpp
index 0a91f85b8..ab12b5ae8 100644
--- a/Source/dthread.cpp
+++ b/Source/dthread.cpp
@@ -86,7 +86,7 @@ void dthread_start()
 	DthreadRunning = true;
 	DthreadMutex.emplace();
 	WorkToDo.emplace();
-	Thread = { DthreadHandler };
+	Thread = SdlThread { DthreadHandler };
 }
 
 void DThreadCleanup()
diff --git a/Source/nthread.cpp b/Source/nthread.cpp
index 5f04bee9f..6c6b7f0ee 100644
--- a/Source/nthread.cpp
+++ b/Source/nthread.cpp
@@ -181,7 +181,7 @@ void nthread_start(bool setTurnUpperBit)
 		sgbThreadIsRunning = false;
 		MemCrit.lock();
 		nthread_should_run = true;
-		Thread = { NthreadHandler };
+		Thread = SdlThread { NthreadHandler };
 	}
 }
 
diff --git a/Source/utils/sdl_thread.h b/Source/utils/sdl_thread.h
index 4aac502c1..079ff6ee2 100644
--- a/Source/utils/sdl_thread.h
+++ b/Source/utils/sdl_thread.h
@@ -34,7 +34,7 @@ public:
 			ErrSdl();
 	}
 
-	SdlThread(void (*handler)(void))
+	explicit SdlThread(void (*handler)(void))
 	    : SdlThread(ThreadTranslate, (void *)handler)
 	{
 	}