diff --git a/src/win32/win32gliface.cpp b/src/win32/win32gliface.cpp
index 2787d9128..c6715b0a7 100644
--- a/src/win32/win32gliface.cpp
+++ b/src/win32/win32gliface.cpp
@@ -259,6 +259,7 @@ void Win32GLVideo::AddMode(int x, int y, int bits, int baseHeight, int refreshHz
 	// not present, add it to the right spot in the list; otherwise, do nothing.
 	// Modes are sorted first by width, then by height, then by depth. In each
 	// case the order is ascending.
+	if (bits < 32) return;
 	for (; probe != 0; probep = &probe->next, probe = probe->next)
 	{
 		if (probe->width != x)		continue;
@@ -269,7 +270,7 @@ void Win32GLVideo::AddMode(int x, int y, int bits, int baseHeight, int refreshHz
 		// Height is equal
 		if (probe->bits != bits)	continue;
 		// Bits is equal
-		if (probe->refreshHz > refreshHz) continue;
+		if (probe->refreshHz > refreshHz) return;
 		probe->refreshHz = refreshHz;
 		return;
 	}