diff --git a/engines/grim/gfx_base.cpp b/engines/grim/gfx_base.cpp
index 59a15043ce1..14bbe383466 100644
--- a/engines/grim/gfx_base.cpp
+++ b/engines/grim/gfx_base.cpp
@@ -46,7 +46,7 @@ namespace Grim {
 GfxBase::GfxBase() :
 		_renderBitmaps(true), _renderZBitmaps(true), _shadowModeActive(false),
 		_currentPos(0, 0, 0), _currentQuat(0, 0, 0, 1), _dimLevel(0.0f),
-		_screenWidth(0), _screenHeight(0), _screenSize(0), _isFullscreen(false),
+		_screenWidth(0), _screenHeight(0), _isFullscreen(false),
 		_scaleW(1.0f), _scaleH(1.0f), _currentShadowArray(nullptr),
 		_shadowColorR(255), _shadowColorG(255), _shadowColorB(255) {
 
diff --git a/engines/grim/gfx_base.h b/engines/grim/gfx_base.h
index 524580eab78..4ee0b9c7982 100644
--- a/engines/grim/gfx_base.h
+++ b/engines/grim/gfx_base.h
@@ -286,7 +286,7 @@ protected:
 	static const int _gameHeight = 480;
 	static const int _gameWidth = 640;
 	float _scaleW, _scaleH;
-	int _screenWidth, _screenHeight, _screenSize;
+	int _screenWidth, _screenHeight;
 	bool _isFullscreen;
 	Shadow *_currentShadowArray;
 	unsigned char _shadowColorR;
diff --git a/engines/grim/gfx_opengl.cpp b/engines/grim/gfx_opengl.cpp
index 9c0d02826d5..7724e47f08c 100644
--- a/engines/grim/gfx_opengl.cpp
+++ b/engines/grim/gfx_opengl.cpp
@@ -145,9 +145,9 @@ byte *GfxOpenGL::setupScreen(int screenW, int screenH, bool fullscreen) {
 	// Load emergency built-in font
 	loadEmergFont();
 
-	_screenSize = _screenWidth * _screenHeight * 4;
-	_storedDisplay = new byte[_screenSize];
-	memset(_storedDisplay, 0, _screenSize);
+	int screenSize = _screenWidth * _screenHeight * 4;
+	_storedDisplay = new byte[screenSize];
+	memset(_storedDisplay, 0, screenSize);
 	_smushNumTex = 0;
 
 	_currentShadowArray = nullptr;
diff --git a/engines/grim/gfx_opengl_shaders.cpp b/engines/grim/gfx_opengl_shaders.cpp
index b4cd8c5fba2..7990b24e7e2 100644
--- a/engines/grim/gfx_opengl_shaders.cpp
+++ b/engines/grim/gfx_opengl_shaders.cpp
@@ -400,7 +400,6 @@ byte *GfxOpenGLS::setupScreen(int screenW, int screenH, bool fullscreen) {
 	// Load emergency built-in font
 	loadEmergFont();
 
-	_screenSize = _screenWidth * _screenHeight * 4;
 	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 	if (g_grim->getGameType() == GType_MONKEY4) {
 		// GL_LEQUAL as glDepthFunc ensures that subsequent drawing attempts for
diff --git a/engines/grim/gfx_tinygl.cpp b/engines/grim/gfx_tinygl.cpp
index 96bb70f4526..af2f43fd6d6 100644
--- a/engines/grim/gfx_tinygl.cpp
+++ b/engines/grim/gfx_tinygl.cpp
@@ -173,7 +173,6 @@ byte *GfxTinyGL::setupScreen(int screenW, int screenH, bool fullscreen) {
 	_zb = new TinyGL::FrameBuffer(screenW, screenH, buf);
 	TinyGL::glInit(_zb, 256);
 
-	_screenSize = _gameWidth * _gameHeight * _pixelFormat.bytesPerPixel;
 	_storedDisplay.create(_pixelFormat, _gameWidth * _gameHeight, DisposeAfterUse::YES);
 	_storedDisplay.clear(_gameWidth * _gameHeight);