diff --git a/ChangeLog b/ChangeLog
index 76b98f64ca..7812570335 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+Wed Feb  5 13:51:33 2014  Koichi Sasada  <ko1@atdot.net>
+
+	* internal.h, vm_core.h: move LIKELY/UNLIKELY/UNINITIALIZED_VAR()
+	  macros from vm_core.h to internal.h.
+
+	* string.c: remove dependency to "vm_core.h".
+
+	* common.mk: ditto.
+
 Wed Feb  5 13:29:01 2014  Koichi Sasada  <ko1@atdot.net>
 
 	* string.c (rb_str_free): use FL_TEST(str, STR_SHARED) directly
diff --git a/common.mk b/common.mk
index 0056fa30d6..8c097e374b 100644
--- a/common.mk
+++ b/common.mk
@@ -751,7 +751,7 @@ st.$(OBJEXT): {$(VPATH)}st.c $(RUBY_H_INCLUDES)
 strftime.$(OBJEXT): {$(VPATH)}strftime.c $(RUBY_H_INCLUDES) \
   {$(VPATH)}timev.h $(ENCODING_H_INCLUDES)
 string.$(OBJEXT): {$(VPATH)}string.c $(RUBY_H_INCLUDES) {$(VPATH)}re.h \
-  {$(VPATH)}regex.h $(ENCODING_H_INCLUDES) {$(VPATH)}internal.h $(PROBES_H_INCLUDES) {$(VPATH)}vm_opts.h {$(VPATH)}node.h {$(VPATH)}ruby_atomic.h {$(VPATH)}vm_core.h {$(VPATH)}vm_debug.h {$(VPATH)}id.h {$(VPATH)}method.h {$(VPATH)}thread_$(THREAD_MODEL).h {$(VPATH)}thread_native.h
+  {$(VPATH)}regex.h $(ENCODING_H_INCLUDES) {$(VPATH)}internal.h $(PROBES_H_INCLUDES)
 struct.$(OBJEXT): {$(VPATH)}struct.c $(RUBY_H_INCLUDES) {$(VPATH)}internal.h
 thread.$(OBJEXT): {$(VPATH)}thread.c {$(VPATH)}eval_intern.h \
   $(RUBY_H_INCLUDES) {$(VPATH)}gc.h $(VM_CORE_H_INCLUDES) \
diff --git a/internal.h b/internal.h
index ddb59d64b3..a057b20ab0 100644
--- a/internal.h
+++ b/internal.h
@@ -19,6 +19,27 @@ extern "C" {
 #endif
 #endif
 
+/* likely */
+#if __GNUC__ >= 3
+#define LIKELY(x)   (__builtin_expect((x), 1))
+#define UNLIKELY(x) (__builtin_expect((x), 0))
+#else /* __GNUC__ >= 3 */
+#define LIKELY(x)   (x)
+#define UNLIKELY(x) (x)
+#endif /* __GNUC__ >= 3 */
+
+#ifndef __has_attribute
+# define __has_attribute(x) 0
+#endif
+
+#if __has_attribute(unused)
+#define UNINITIALIZED_VAR(x) x __attribute__((unused))
+#elif defined(__GNUC__) && __GNUC__ >= 3
+#define UNINITIALIZED_VAR(x) x = x
+#else
+#define UNINITIALIZED_VAR(x) x
+#endif
+
 #ifdef HAVE_VALGRIND_MEMCHECK_H
 # include <valgrind/memcheck.h>
 # ifndef VALGRIND_MAKE_MEM_DEFINED
diff --git a/string.c b/string.c
index 0110c0a3a0..589c80088e 100644
--- a/string.c
+++ b/string.c
@@ -14,7 +14,6 @@
 #include "ruby/ruby.h"
 #include "ruby/re.h"
 #include "ruby/encoding.h"
-#include "vm_core.h"
 #include "internal.h"
 #include "probes.h"
 #include <assert.h>
diff --git a/vm_core.h b/vm_core.h
index fb0ff6ddb4..b1b9cadf98 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -100,27 +100,6 @@
 #endif /* OPT_STACK_CACHING */
 #endif /* OPT_CALL_THREADED_CODE */
 
-/* likely */
-#if __GNUC__ >= 3
-#define LIKELY(x)   (__builtin_expect((x), 1))
-#define UNLIKELY(x) (__builtin_expect((x), 0))
-#else /* __GNUC__ >= 3 */
-#define LIKELY(x)   (x)
-#define UNLIKELY(x) (x)
-#endif /* __GNUC__ >= 3 */
-
-#ifndef __has_attribute
-# define __has_attribute(x) 0
-#endif
-
-#if __has_attribute(unused)
-#define UNINITIALIZED_VAR(x) x __attribute__((unused))
-#elif defined(__GNUC__) && __GNUC__ >= 3
-#define UNINITIALIZED_VAR(x) x = x
-#else
-#define UNINITIALIZED_VAR(x) x
-#endif
-
 typedef unsigned long rb_num_t;
 
 /* iseq data type */