diff --git a/src/win32/win32gliface.cpp b/src/win32/win32gliface.cpp
index aa4755e48..c4b5b7b43 100644
--- a/src/win32/win32gliface.cpp
+++ b/src/win32/win32gliface.cpp
@@ -352,6 +352,11 @@ DFrameBuffer *Win32GLVideo::CreateFrameBuffer(int width, int height, bool fs, DF
 {
 	Win32GLFrameBuffer *fb;
 
+	if (fs)
+	{
+		I_ClosestResolution(&width, &height, 32);
+	}
+
 	m_DisplayWidth = width;
 	m_DisplayHeight = height;
 	m_DisplayBits = 32;
diff --git a/src/win32/win32video.cpp b/src/win32/win32video.cpp
index 0d91ed1d0..015a344e0 100644
--- a/src/win32/win32video.cpp
+++ b/src/win32/win32video.cpp
@@ -641,6 +641,11 @@ DFrameBuffer *Win32Video::CreateFrameBuffer (int width, int height, bool fullscr
 	PalEntry flashColor;
 	int flashAmount;
 
+	if (fullscreen)
+	{
+		I_ClosestResolution(&width, &height, D3D ? 32 : 8);
+	}
+
 	LOG4 ("CreateFB %d %d %d %p\n", width, height, fullscreen, old);
 
 	if (old != NULL)