diff --git a/gfxconf.example.h b/gfxconf.example.h
index de4ed230..9f901fce 100644
--- a/gfxconf.example.h
+++ b/gfxconf.example.h
@@ -36,6 +36,7 @@
 //#define GFX_USE_OS_RAWRTOS                           FALSE
 //#define GFX_USE_OS_ARDUINO                           FALSE
 //#define GFX_USE_OS_KEIL                              FALSE
+//#define GFX_USE_OS_CMSIS                             FALSE
 //#define GFX_USE_OS_RAW32                             FALSE
 //    #define INTERRUPTS_OFF()                         optional_code
 //    #define INTERRUPTS_ON()                          optional_code
diff --git a/src/gos/gos.h b/src/gos/gos.h
index 048d5765..4463740d 100644
--- a/src/gos/gos.h
+++ b/src/gos/gos.h
@@ -474,6 +474,10 @@
 	#include "src/gos/gos_ecos.h"
 #elif GFX_USE_OS_ARDUINO
 	#include "src/gos/gos_arduino.h"
+#elif GFX_USE_OS_CMSIS
+ 	#include "src/gos/gos_cmsis.h"
+#elif GFX_USE_OS_KEIL
+ 	#include "src/gos/gos_keil.h"
 #else
 	#error "Your operating system is not supported yet"
 #endif