2 files changed, 7 insertions, 1 deletions
diff --git a/ChangeLog b/ChangeLog
index 84ce9ee853..7c5a66d07b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Jun 20 18:16:01 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* string.c (rb_str_buf_append): should infect.
+
 Fri Jun 20 15:40:02 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* array.c (rb_ary_store, rb_ary_splice): not depend on unspecified
diff --git a/string.c b/string.c
index c3b1975a2d..5f1d95806d 100644
--- a/string.c
+++ b/string.c
@@ -793,7 +793,9 @@ VALUE
 rb_str_buf_append(str, str2)
     VALUE str, str2;
 {
-    return str_buf_cat(str, RSTRING(str2)->ptr, RSTRING(str2)->len);
+    str_buf_cat(str, RSTRING(str2)->ptr, RSTRING(str2)->len);
+    OBJ_INFECT(str, str2);
+    return str;
 }
 
 VALUE