diff --git a/ChangeLog b/ChangeLog
index a73b51812b..5851770aee 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Sep  8 16:53:30 2006  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* string.c (str_alloc): should allocate a String object, even when
+	  asked to allocate a Symbol object.  [ruby-dev:29529]
+
 Fri Sep  8 16:36:27 2006  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* ext/extmk.rb (extmake): follow Array#to_s.
diff --git a/string.c b/string.c
index 3935eb426e..59b81b44e6 100644
--- a/string.c
+++ b/string.c
@@ -119,6 +119,9 @@ str_alloc(VALUE klass)
     NEWOBJ(str, struct RString);
     OBJSETUP(str, klass, T_STRING);
 
+    if (klass == rb_cSymbol) {
+	RBASIC(str)->klass = rb_cString;
+    }
     str->as.heap.ptr = 0;
     str->as.heap.len = 0;
     str->as.heap.aux.capa = 0;
@@ -135,7 +138,6 @@ str_new(VALUE klass, const char *ptr, long len)
 	rb_raise(rb_eArgError, "negative string size (or size too big)");
     }
 
-    if (klass == rb_cSymbol) klass = rb_cString;
     str = str_alloc(klass);
     if (len > RSTRING_EMBED_LEN_MAX) {
 	RSTRING(str)->as.heap.aux.capa = len;