diff --git a/.gitignore b/.gitignore
index 05a759c8b..d1304b75b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,7 @@
 /Release
 /wadsrc_wad
 *.user
+/build
 /debug
 /release
 */debug
diff --git a/CMakeLists.txt b/CMakeLists.txt
index a7bae2b4c..fb335c1f1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -61,7 +61,8 @@ if( MSVC )
 	# String pooling
 	# Function-level linking
 	# Disable run-time type information
-	set( ALL_C_FLAGS "/GF /Gy /GR-" )
+	# Set floating point model to fast or the GL render will suffer for it.
+	set( ALL_C_FLAGS "/GF /Gy /GR- /fp:fast" )
 	
 	# Avoid CRT DLL dependancies in release builds
 	set( REL_C_FLAGS "/MT" )