diff --git a/include/STTypes.h b/include/STTypes.h
index 46da0fe..63950e1 100644
--- a/include/STTypes.h
+++ b/include/STTypes.h
@@ -63,7 +63,11 @@ typedef unsigned long   ulong;
 #ifndef _WINDEF_
     // if these aren't defined already by Windows headers, define now
 
-    typedef int BOOL;
+#if defined(__APPLE__)
+   typedef signed char BOOL;
+#else
+   typedef int BOOL;
+#endif 
 
     #define FALSE   0
     #define TRUE    1
diff --git a/source/SoundTouch/cpu_detect_x86.cpp b/source/SoundTouch/cpu_detect_x86.cpp
index c30476c..55be6ed 100644
--- a/source/SoundTouch/cpu_detect_x86.cpp
+++ b/source/SoundTouch/cpu_detect_x86.cpp
@@ -42,19 +42,20 @@
 #include "cpu_detect.h"
 #include "STTypes.h"
 
+
 #if defined(SOUNDTOUCH_ALLOW_X86_OPTIMIZATIONS)
 
-    #if defined(__GNUC__) && defined(__i386__)
-        // gcc
-        #include "cpuid.h"
-    #elif defined(_M_IX86)
-        // windows non-gcc
-        #include <intrin.h>
-        #define bit_MMX     (1 << 23)
-        #define bit_SSE     (1 << 25)
-        #define bit_SSE2    (1 << 26)
-    #endif
+   #if defined(__GNUC__) && defined(__i386__)
+       // gcc
+       #include "cpuid.h"
+   #elif defined(_M_IX86)
+       // windows non-gcc
+       #include <intrin.h>
+   #endif
 
+   #define bit_MMX     (1 << 23)
+   #define bit_SSE     (1 << 25)
+   #define bit_SSE2    (1 << 26)
 #endif