diff --git a/src/posix/cocoa/i_video.mm b/src/posix/cocoa/i_video.mm
index c89a6601d..2c305b49e 100644
--- a/src/posix/cocoa/i_video.mm
+++ b/src/posix/cocoa/i_video.mm
@@ -1523,10 +1523,16 @@ void I_SetMainWindowVisible(bool visible)
 // each platform has its own specific version of this function.
 void I_SetWindowTitle(const char* title)
 {
-	static NSString* const TITLE_STRING;
 	if (title)
-		TITLE_STRING = [NSString stringWithFormat:@"%s", title];
+	{
+		static NSString* const TITLE_STRING =
+		[NSString stringWithFormat:@"%s", title];
+		[m_window setTitle:TITLE_STRING];
+	}
 	else
-		TITLE_STRING = [NSString stringWithFormat:@"%s %s", GAMESIG, GetVersionString()];
-	[m_window setTitle:TITLE_STRING];
-}
\ No newline at end of file
+	{
+		static NSString* const TITLE_STRING =
+		[NSString stringWithFormat:@"%s %s", GAMESIG, GetVersionString()];
+		[m_window setTitle:TITLE_STRING];
+	}
+}
diff --git a/src/posix/sdl/sdlvideo.cpp b/src/posix/sdl/sdlvideo.cpp
index 318a91e6e..6a0420ae8 100644
--- a/src/posix/sdl/sdlvideo.cpp
+++ b/src/posix/sdl/sdlvideo.cpp
@@ -556,11 +556,12 @@ ADD_STAT (blit)
 void I_SetWindowTitle(const char* caption)
 {
 	if (caption)
-		SDL_SetWindowTitle(Screen, caption);
+		SDL_SetWindowTitle(static_cast<SDLFB *>(screen)->GetSDLWindow(), caption);
 	else
 	{
 		FString default_caption;
 		default_caption.Format(GAMESIG " %s (%s)", GetVersionString(), GetGitTime());
-		SDL_SetWindowTitle(Screen, default_caption);
+		SDL_SetWindowTitle(static_cast<SDLFB *>(screen)->GetSDLWindow(), default_caption);
 	}
 }
+