diff --git a/colorchord2/windows/compile-clang.bat b/colorchord2/windows/compile-clang.bat
index ca9c46a..a669412 100644
--- a/colorchord2/windows/compile-clang.bat
+++ b/colorchord2/windows/compile-clang.bat
@@ -1,7 +1,7 @@
 @echo off
 set CC="C:\Program Files\LLVM\bin\clang.exe"
 rem To enable OpenGL rendering use the -DCNFGOGL option
-set CCFLAGS=-g -D_CRT_SECURE_NO_WARNINGS 
+set CCFLAGS=-g -D_CRT_SECURE_NO_WARNINGS -DCNFGOGL
 set CCIFLAGS=-I../../embeddedcommon -I../cnfa -I../rawdraw -I../ -O2
 set CCLFLAGS=-lwinmm -lgdi32 -lws2_32 -lsetupapi -lkernel32 -luser32 -ldbghelp -lole32 -lmmdevapi -lAvrt -lopengl32
 set SOURCES=../main.c  ../dft.c ../decompose.c ../filter.c ../color.c ../notefinder.c ../util.c ../outdrivers.c ^