diff --git a/src/posix/cocoa/gl_sysfb.h b/src/posix/cocoa/gl_sysfb.h
index 2a2b8a5d2..664abee81 100644
--- a/src/posix/cocoa/gl_sysfb.h
+++ b/src/posix/cocoa/gl_sysfb.h
@@ -91,8 +91,6 @@ private:
 
 	int GetTitleBarHeight() const;
 
-	static const int MINIMUM_WIDTH  = 640;
-	static const int MINIMUM_HEIGHT = 400;
 };
 
 #endif // COCOA_GL_SYSFB_H_INCLUDED
diff --git a/src/posix/cocoa/i_video.mm b/src/posix/cocoa/i_video.mm
index d18099ca1..58a929f9b 100644
--- a/src/posix/cocoa/i_video.mm
+++ b/src/posix/cocoa/i_video.mm
@@ -35,6 +35,7 @@
 
 #include "i_common.h"
 
+#include "v_video.h"
 #include "bitmap.h"
 #include "c_dispatch.h"
 #include "doomstat.h"
@@ -345,7 +346,7 @@ void SystemGLFrameBuffer::ToggleFullscreen(bool yes)
 
 void SystemGLFrameBuffer::SetWindowSize(int width, int height)
 {
-	if (width < MINIMUM_WIDTH || height < MINIMUM_HEIGHT)
+	if (width < VID_MIN_WIDTH || height < VID_MIN_HEIGHT)
 	{
 		return;
 	}
@@ -426,8 +427,8 @@ void SystemGLFrameBuffer::SetWindowedMode()
 		[m_window setHidesOnDeactivate:NO];
 	}
 
-	const int minimumFrameWidth  = MINIMUM_WIDTH;
-	const int minimumFrameHeight = MINIMUM_HEIGHT + GetTitleBarHeight();
+	const int minimumFrameWidth  = VID_MIN_WIDTH;
+	const int minimumFrameHeight = VID_MIN_HEIGHT + GetTitleBarHeight();
 	const NSSize minimumFrameSize = NSMakeSize(minimumFrameWidth, minimumFrameHeight);
 	[m_window setMinSize:minimumFrameSize];
 
diff --git a/src/r_videoscale.cpp b/src/r_videoscale.cpp
index fbd7393c5..493fd122a 100644
--- a/src/r_videoscale.cpp
+++ b/src/r_videoscale.cpp
@@ -32,16 +32,16 @@
 extern bool setsizeneeded;
 
 EXTERN_CVAR(Int, vid_aspect)
-CUSTOM_CVAR(Int, vid_scale_customwidth, 640, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
+CUSTOM_CVAR(Int, vid_scale_customwidth, VID_MIN_WIDTH, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
 {
-	if (self < 640)
-		self = 640;
+	if (self < VID_MIN_WIDTH)
+		self = VID_MIN_WIDTH;
 	setsizeneeded = true;
 }
-CUSTOM_CVAR(Int, vid_scale_customheight, 400, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
+CUSTOM_CVAR(Int, vid_scale_customheight, VID_MIN_HEIGHT, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
 {
-	if (self < 400)
-		self = 400;
+	if (self < VID_MIN_HEIGHT)
+		self = VID_MIN_HEIGHT;
 	setsizeneeded = true;
 }
 CVAR(Bool, vid_scale_customlinear, false, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
@@ -116,7 +116,7 @@ int ViewportScaledWidth(int width, int height)
 		vid_scalemode = 0;
 	if (vid_cropaspect && height > 0)
 		width = ((float)width/height > ActiveRatio(width, height)) ? (int)(height * ActiveRatio(width, height)) : width;
-	return (int)MAX((int32_t)320, (int32_t)(vid_scalefactor * vScaleTable[vid_scalemode].GetScaledWidth(width)));
+	return (int)MAX((int32_t)VID_MIN_WIDTH, (int32_t)(vid_scalefactor * vScaleTable[vid_scalemode].GetScaledWidth(width)));
 }
 
 int ViewportScaledHeight(int width, int height)
@@ -125,7 +125,7 @@ int ViewportScaledHeight(int width, int height)
 		vid_scalemode = 0;
 	if (vid_cropaspect && height > 0)
 		height = ((float)width/height < ActiveRatio(width, height)) ? (int)(width / ActiveRatio(width, height)) : height;
-	return (int)MAX((int32_t)200, (int32_t)(vid_scalefactor * vScaleTable[vid_scalemode].GetScaledHeight(height)));
+	return (int)MAX((int32_t)VID_MIN_HEIGHT, (int32_t)(vid_scalefactor * vScaleTable[vid_scalemode].GetScaledHeight(height)));
 }
 
 bool ViewportIsScaled43()
diff --git a/src/v_framebuffer.cpp b/src/v_framebuffer.cpp
index 3a569cb1d..24cbb1914 100644
--- a/src/v_framebuffer.cpp
+++ b/src/v_framebuffer.cpp
@@ -210,8 +210,8 @@ void DFrameBuffer::Update()
 	int initialHeight = GetClientHeight();
 	int clientWidth = ViewportScaledWidth(initialWidth, initialHeight);
 	int clientHeight = ViewportScaledHeight(initialWidth, initialHeight);
-	if (clientWidth < 640) clientWidth = 640;
-	if (clientHeight < 400) clientHeight = 400;
+	if (clientWidth < VID_MIN_WIDTH) clientWidth = VID_MIN_WIDTH;
+	if (clientHeight < VID_MIN_HEIGHT) clientHeight = VID_MIN_HEIGHT;
 	if (clientWidth > 0 && clientHeight > 0 && (GetWidth() != clientWidth || GetHeight() != clientHeight))
 	{
 		SetVirtualSize(clientWidth, clientHeight);
diff --git a/src/v_video.h b/src/v_video.h
index 7f35f3322..39089388c 100644
--- a/src/v_video.h
+++ b/src/v_video.h
@@ -46,6 +46,9 @@
 #include "v_2ddrawer.h"
 #include "hwrenderer/dynlights/hw_shadowmap.h"
 
+static const int VID_MIN_WIDTH = 640;
+static const int VID_MIN_HEIGHT = 400;
+
 struct sector_t;
 class IShaderProgram;
 class FTexture;
diff --git a/src/win32/i_input.cpp b/src/win32/i_input.cpp
index b8f5ba777..74791cc5c 100644
--- a/src/win32/i_input.cpp
+++ b/src/win32/i_input.cpp
@@ -525,8 +525,8 @@ LRESULT CALLBACK WndProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 			}
 			else
 			{
-				mmi->ptMinTrackSize.x = 640;
-				mmi->ptMinTrackSize.y = 400;
+				mmi->ptMinTrackSize.x = VID_MIN_WIDTH;
+				mmi->ptMinTrackSize.y = VID_MIN_HEIGHT;
 			}
 			return 0;
 		}