diff --git a/Makefile b/Makefile
index 513149b..4248886 100644
--- a/Makefile
+++ b/Makefile
@@ -5,15 +5,16 @@ CXX	       ?= g++
 
 CORE_DIR     := .
 
+# platform
 ifeq ($(platform),)
 platform = unix
-ifeq ($(shell uname -a),)
+ifeq ($(shell uname -s),)
    platform = win
-else ifneq ($(findstring MINGW,$(shell uname -a)),)
+else ifneq ($(findstring MINGW,$(shell uname -s)),)
    platform = win
-else ifneq ($(findstring Darwin,$(shell uname -a)),)
+else ifneq ($(findstring Darwin,$(shell uname -s)),)
    platform = osx
-else ifneq ($(findstring win,$(shell uname -a)),)
+else ifneq ($(findstring win,$(shell uname -s)),)
    platform = win
 endif
 endif
@@ -58,7 +59,6 @@ else ifeq ($(platform), osx)
    fpic := -fPIC
    SHARED := -dynamiclib
 
-
 ifeq ($(UNIVERSAL),1)
 ifeq ($(ARCHFLAGS),)
    ARCHFLAGS = -arch i386 -arch x86_64