diff --git a/ChangeLog b/ChangeLog
index 630f7c2f3c..7dea2c4ed7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Oct 27 09:27:59 2009  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* vm_exec.c (DECL_SC_REG): use __clang__.
+
 Tue Oct 27 08:56:11 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* mkconfig.rb: reverted r25443 because build_os is used in mkmf.rb
diff --git a/vm_exec.c b/vm_exec.c
index a2c3541727..d7f9addfd4 100644
--- a/vm_exec.c
+++ b/vm_exec.c
@@ -14,10 +14,10 @@
 #if VMDEBUG > 0
 #define DECL_SC_REG(type, r, reg) register type reg_##r
 
-#elif __GNUC__ && __x86_64__ && defined(__asm__)
+#elif __GNUC__ && __x86_64__ && !__clang__
 #define DECL_SC_REG(type, r, reg) register type reg_##r __asm__("r" reg)
 
-#elif __GNUC__ && __i386__ && defined(__asm__)
+#elif __GNUC__ && __i386__ && !__clang__
 #define DECL_SC_REG(type, r, reg) register type reg_##r __asm__("e" reg)
 
 #else