diff --git a/ChangeLog b/ChangeLog
index 1df5d5b606..452a7adc4c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Thu May 29 05:05:29 2014  Eric Wong  <e@80x24.org>
+
+	* include/ruby/ruby.h: Hide Symbol internals.
+	  (struct RSymbol): moved to internal.h
+	  (RSYMBOL): ditto
+
 Thu May 29 00:28:56 2014  Tanaka Akira  <akr@fsij.org>
 
 	* ext/socket/unixsocket.c (rsock_init_unixsock): Open a socket
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index a39b958617..7c7cb67d99 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -952,12 +952,6 @@ struct RComplex {
 #define RCOMPLEX_SET_REAL(cmp, r) RB_OBJ_WRITE((cmp), &((struct RComplex *)(cmp))->real,(r))
 #define RCOMPLEX_SET_IMAG(cmp, i) RB_OBJ_WRITE((cmp), &((struct RComplex *)(cmp))->imag,(i))
 
-struct RSymbol {
-    struct RBasic basic;
-    VALUE fstr;
-    ID type;
-};
-
 struct RData {
     struct RBasic basic;
     void (*dmark)(void*);
@@ -1093,7 +1087,6 @@ struct RStruct {
 #define RSTRUCT(obj) (R_CAST(RStruct)(obj))
 #define RFILE(obj)   (R_CAST(RFile)(obj))
 #define RCOMPLEX(obj) (R_CAST(RComplex)(obj))
-#define RSYMBOL(obj) (R_CAST(RSymbol)(obj))
 
 #define FL_SINGLETON FL_USER0
 #define FL_WB_PROTECTED (((VALUE)1)<<5)
diff --git a/internal.h b/internal.h
index 071f3ed6af..c4a2d8d4b1 100644
--- a/internal.h
+++ b/internal.h
@@ -412,6 +412,14 @@ struct RRational {
 
 #define RRATIONAL(obj) (R_CAST(RRational)(obj))
 
+struct RSymbol {
+    struct RBasic basic;
+    VALUE fstr;
+    ID type;
+};
+
+#define RSYMBOL(obj) (R_CAST(RSymbol)(obj))
+
 /* class.c */
 void rb_class_subclass_add(VALUE super, VALUE klass);
 void rb_class_remove_from_super_subclasses(VALUE);