diff --git a/src/i_video.h b/src/i_video.h
index b1c56c9a6..2de136fd3 100644
--- a/src/i_video.h
+++ b/src/i_video.h
@@ -13,8 +13,6 @@ DFrameBuffer *I_SetMode (int &width, int &height, DFrameBuffer *old);
 // the original DOS version (if the Heretic/Hexen source is any indicator).
 void I_WaitVBL(int count);
 
-bool I_CheckResolution (int width, int height, int bpp);
-void I_ClosestResolution (int *width, int *height, int bits);
 
 enum EDisplayType
 {
diff --git a/src/posix/cocoa/i_video.mm b/src/posix/cocoa/i_video.mm
index 8593f86e7..cee330336 100644
--- a/src/posix/cocoa/i_video.mm
+++ b/src/posix/cocoa/i_video.mm
@@ -758,67 +758,6 @@ DFrameBuffer* I_SetMode(int &width, int &height, DFrameBuffer* old)
 	return Video->CreateFrameBuffer(width, height, false, fullscreen, old);
 }
 
-bool I_CheckResolution(const int width, const int height, const int bits)
-{
-	int twidth, theight;
-
-	Video->StartModeIterator(bits, fullscreen);
-
-	while (Video->NextMode(&twidth, &theight, NULL))
-	{
-		if (width == twidth && height == theight)
-		{
-			return true;
-		}
-	}
-
-	return false;
-}
-
-void I_ClosestResolution(int *width, int *height, int bits)
-{
-	int twidth, theight;
-	int cwidth = 0, cheight = 0;
-	int iteration;
-	uint32_t closest = uint32_t(-1);
-
-	for (iteration = 0; iteration < 2; ++iteration)
-	{
-		Video->StartModeIterator(bits, fullscreen);
-
-		while (Video->NextMode(&twidth, &theight, NULL))
-		{
-			if (twidth == *width && theight == *height)
-			{
-				return;
-			}
-
-			if (iteration == 0 && (twidth < *width || theight < *height))
-			{
-				continue;
-			}
-
-			const uint32_t dist = (twidth - *width) * (twidth - *width)
-				+ (theight - *height) * (theight - *height);
-
-			if (dist < closest)
-			{
-				closest = dist;
-				cwidth = twidth;
-				cheight = theight;
-			}
-		}
-
-		if (closest != uint32_t(-1))
-		{
-			*width = cwidth;
-			*height = cheight;
-			return;
-		}
-	}
-}
-
-
 // ---------------------------------------------------------------------------
 
 
diff --git a/src/posix/sdl/hardware.cpp b/src/posix/sdl/hardware.cpp
index 3c000cb8e..d1ba32b1c 100644
--- a/src/posix/sdl/hardware.cpp
+++ b/src/posix/sdl/hardware.cpp
@@ -123,56 +123,6 @@ DFrameBuffer *I_SetMode (int &width, int &height, DFrameBuffer *old)
 	return res;
 }
 
-bool I_CheckResolution (int width, int height, int bits)
-{
-	int twidth, theight;
-
-	Video->StartModeIterator (bits, screen ? screen->IsFullscreen() : fullscreen);
-	while (Video->NextMode (&twidth, &theight, NULL))
-	{
-		if (width == twidth && height == theight)
-			return true;
-	}
-	return false;
-}
-
-void I_ClosestResolution (int *width, int *height, int bits)
-{
-	int twidth, theight;
-	int cwidth = 0, cheight = 0;
-	int iteration;
-	uint32_t closest = 4294967295u;
-
-	for (iteration = 0; iteration < 2; iteration++)
-	{
-		Video->StartModeIterator (bits, screen ? screen->IsFullscreen() : fullscreen);
-		while (Video->NextMode (&twidth, &theight, NULL))
-		{
-			if (twidth == *width && theight == *height)
-				return;
-
-			if (iteration == 0 && (twidth < *width || theight < *height))
-				continue;
-
-			uint32_t dist = (twidth - *width) * (twidth - *width)
-				+ (theight - *height) * (theight - *height);
-
-			if (dist < closest)
-			{
-				closest = dist;
-				cwidth = twidth;
-				cheight = theight;
-			}
-		}
-		if (closest != 4294967295u)
-		{
-			*width = cwidth;
-			*height = cheight;
-			return;
-		}
-	}
-}
-
 //==========================================================================
 //
 // SetFPSLimit
diff --git a/src/v_video.cpp b/src/v_video.cpp
index 193cfae2f..ae34f22a3 100644
--- a/src/v_video.cpp
+++ b/src/v_video.cpp
@@ -1114,6 +1114,66 @@ void V_CalcCleanFacs (int designwidth, int designheight, int realwidth, int real
 	if (_cx2 != NULL)	*_cx2 = cx2;
 }
 
+bool V_CheckResolution(const int width, const int height, const int bits)
+{
+	int twidth, theight;
+
+	Video->StartModeIterator(bits, fullscreen);
+
+	while (Video->NextMode(&twidth, &theight, NULL))
+	{
+		if (width == twidth && height == theight)
+		{
+			return true;
+		}
+	}
+
+	return false;
+}
+
+void V_ClosestResolution(int *width, int *height, int bits)
+{
+	int twidth, theight;
+	int cwidth = 0, cheight = 0;
+	int iteration;
+	uint32_t closest = uint32_t(-1);
+
+	for (iteration = 0; iteration < 2; ++iteration)
+	{
+		Video->StartModeIterator(bits, fullscreen);
+
+		while (Video->NextMode(&twidth, &theight, NULL))
+		{
+			if (twidth == *width && theight == *height)
+			{
+				return;
+			}
+
+			if (iteration == 0 && (twidth < *width || theight < *height))
+			{
+				continue;
+			}
+
+			const uint32_t dist = (twidth - *width) * (twidth - *width)
+				+ (theight - *height) * (theight - *height);
+
+			if (dist < closest)
+			{
+				closest = dist;
+				cwidth = twidth;
+				cheight = theight;
+			}
+		}
+
+		if (closest != uint32_t(-1))
+		{
+			*width = cwidth;
+			*height = cheight;
+			return;
+		}
+	}
+}
+
 bool IVideo::SetResolution (int width, int height, int bits)
 {
 	int oldwidth, oldheight;
@@ -1132,10 +1192,10 @@ bool IVideo::SetResolution (int width, int height, int bits)
 		oldbits = bits;
 	}
 
-	I_ClosestResolution (&width, &height, bits);
-	if (!I_CheckResolution (width, height, bits))
+	V_ClosestResolution (&width, &height, bits);
+	if (!V_CheckResolution (width, height, bits))
 	{ // Try specified resolution
-		if (!I_CheckResolution (oldwidth, oldheight, oldbits))
+		if (!V_CheckResolution (oldwidth, oldheight, oldbits))
 		{ // Try previous resolution (if any)
 	   		return false;
 		}
@@ -1168,7 +1228,7 @@ CCMD (vid_setmode)
 	}
 
 	const bool goodmode = (width > 0 && height > 0)
-		&& (!fullscreen || (Video != nullptr && I_CheckResolution(width, height, bits)));
+		&& (!fullscreen || (Video != nullptr && V_CheckResolution(width, height, bits)));
 
 	if (goodmode)
 	{
@@ -1267,7 +1327,7 @@ void V_Init2()
 	}
 
 	I_InitGraphics();
-	I_ClosestResolution (&width, &height, 8);
+	V_ClosestResolution (&width, &height, 8);
 
 	if (!Video->SetResolution (width, height, 8))
 		I_FatalError ("Could not set resolution to %d x %d x %d", width, height, 8);
diff --git a/src/win32/hardware.cpp b/src/win32/hardware.cpp
index f79e6276c..97dfa4403 100644
--- a/src/win32/hardware.cpp
+++ b/src/win32/hardware.cpp
@@ -185,56 +185,6 @@ DFrameBuffer *I_SetMode (int &width, int &height, DFrameBuffer *old)
 	return res;
 }
 
-bool I_CheckResolution (int width, int height, int bits)
-{
-	int twidth, theight;
-
-	Video->StartModeIterator (bits, screen ? screen->IsFullscreen() : fullscreen);
-	while (Video->NextMode (&twidth, &theight, NULL))
-	{
-		if (width == twidth && height == theight)
-			return true;
-	}
-	return false;
-}
-
-void I_ClosestResolution (int *width, int *height, int bits)
-{
-	int twidth, theight;
-	int cwidth = 0, cheight = 0;
-	int iteration;
-	DWORD closest = 4294967295u;
-
-	for (iteration = 0; iteration < 2; iteration++)
-	{
-		Video->StartModeIterator (bits, screen ? screen->IsFullscreen() : fullscreen);
-		while (Video->NextMode (&twidth, &theight, NULL))
-		{
-			if (twidth == *width && theight == *height)
-				return;
-
-			if (iteration == 0 && (twidth < *width || theight < *height))
-				continue;
-
-			DWORD dist = (twidth - *width) * (twidth - *width)
-				+ (theight - *height) * (theight - *height);
-
-			if (dist < closest)
-			{
-				closest = dist;
-				cwidth = twidth;
-				cheight = theight;
-			}
-		}
-		if (closest != 4294967295u)
-		{
-			*width = cwidth;
-			*height = cheight;
-			return;
-		}
-	}
-}	
-
 static void GetCenteredPos (int &winx, int &winy, int &winw, int &winh, int &scrwidth, int &scrheight)
 {
 	DEVMODE displaysettings;
diff --git a/src/win32/win32gliface.cpp b/src/win32/win32gliface.cpp
index cb6da5ff9..300d8b4c3 100644
--- a/src/win32/win32gliface.cpp
+++ b/src/win32/win32gliface.cpp
@@ -453,6 +453,7 @@ bool Win32GLVideo::GoFullscreen(bool yes)
 // 
 //
 //==========================================================================
+void V_ClosestResolution(int *width, int *height, int bits);
 
 
 DFrameBuffer *Win32GLVideo::CreateFrameBuffer(int width, int height, bool bgra, bool fs, DFrameBuffer *old)
@@ -461,7 +462,7 @@ DFrameBuffer *Win32GLVideo::CreateFrameBuffer(int width, int height, bool bgra,
 
 	if (fs)
 	{
-		I_ClosestResolution(&width, &height, 32);
+		V_ClosestResolution(&width, &height, 32);
 	}
 
 	m_DisplayWidth = width;