diff --git a/gfx.h b/gfx.h
index aeced09e..53c9b94f 100644
--- a/gfx.h
+++ b/gfx.h
@@ -286,7 +286,7 @@
 		#define GFX_COMPILER	GFX_COMPILER_MINGW64
 	#elif defined(__CYGWIN__)
 		#define GFX_COMPILER	GFX_COMPILER_CYGWIN
-	#elif defined(__KEIL__) || defined(__C51__)
+	#elif defined(__KEIL__) || defined(__C51__) || (defined(__CC_ARM) && defined(__EDG__))
 		#define GFX_COMPILER	GFX_COMPILER_KEIL
 	#elif defined(__clang__)
 		#define GFX_COMPILER	GFX_COMPILER_CLANG
@@ -392,7 +392,7 @@
 #if GFX_NO_INLINE
 	#define GFXINLINE
 #else
-	#if defined(__KEIL__) || defined(__C51__)
+	#if GFX_COMPILER == GFX_COMILER_KEIL
 		#define GFXINLINE	__inline
 	#else
 		#define GFXINLINE	inline
diff --git a/src/gos/gos_x_threads.c b/src/gos/gos_x_threads.c
index 8a781b21..bdb61ab9 100644
--- a/src/gos/gos_x_threads.c
+++ b/src/gos/gos_x_threads.c
@@ -203,12 +203,12 @@ static thread		mainthread;				// The main thread context
 	 * If they don't exist compile them to be the standard setjmp() function.
 	 * Similarly for longjmp().
 	 */
-	#if (!defined(setjmp) && !defined(_setjmp)) || defined(__KEIL__) || defined(__C51__)
+	#if (!defined(setjmp) && !defined(_setjmp)) || GFX_COMPILER == GFX_COMILER_KEIL
 		#define CXT_SAVE 		setjmp
 	#else
 		#define CXT_SAVE 		_setjmp
 	#endif
-	#if (!defined(longjmp) && !defined(_longjmp)) || defined(__KEIL__) || defined(__C51__)
+	#if (!defined(longjmp) && !defined(_longjmp)) || GFX_COMPILER == GFX_COMILER_KEIL
 		#define CXT_RESTORE 	longjmp
 	#else
 		#define CXT_RESTORE 	_longjmp
diff --git a/src/gwin/gwin_class.h b/src/gwin/gwin_class.h
index 7946a839..ac89f672 100644
--- a/src/gwin/gwin_class.h
+++ b/src/gwin/gwin_class.h
@@ -23,7 +23,7 @@
 
 #if GFX_USE_GWIN || defined(__DOXYGEN__)
 
-#if defined(__KEIL__) || defined(__C51__)
+#if GFX_COMPILER == GFX_COMILER_KEIL
 	#pragma anon_unions
 #endif