diff --git a/ChangeLog b/ChangeLog
index e28863fba1..31d7bb3ef9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Oct 27 05:11:49 2009  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* vm_exec.c (DECL_SC_REG): check defined(__asm__) before use it.
+	  LLVM/clang defines __GNUC__ but doesn't have __asm__..
+
 Tue Oct 27 03:45:39 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* win32/Makefile.sub (config.h): added RUBY_SITEARCH to use
diff --git a/vm_exec.c b/vm_exec.c
index 51b8a0f142..a2c3541727 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__
+#elif __GNUC__ && __x86_64__ && defined(__asm__)
 #define DECL_SC_REG(type, r, reg) register type reg_##r __asm__("r" reg)
 
-#elif __GNUC__ && __i386__
+#elif __GNUC__ && __i386__ && defined(__asm__)
 #define DECL_SC_REG(type, r, reg) register type reg_##r __asm__("e" reg)
 
 #else