diff --git a/ChangeLog b/ChangeLog
index 35a8f72918..e2a1a07b47 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Mon Nov 26 17:10:04 2012  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* string.c (rb_str_enumerate_chars, rb_str_enumerate_codepoints)
+	(rb_str_enumerate_lines): suppress "may be used uninitialized in
+	  this function" warning.
+
 Mon Nov 26 17:00:12 2012  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
 
 	* vm_core.h (rb_thread_struct): added 'in_trap' member for marking
diff --git a/string.c b/string.c
index 82c709ca1d..fcbffdc37b 100644
--- a/string.c
+++ b/string.c
@@ -6109,7 +6109,7 @@ rb_str_enumerate_lines(int argc, VALUE *argv, VALUE str, int wantarray)
     VALUE line;
     int n;
     VALUE orig = str;
-    VALUE ary;
+    VALUE UNINITIALIZED_VAR(ary);
 
     if (argc == 0) {
 	rs = rb_rs;
@@ -6396,7 +6396,7 @@ rb_str_enumerate_chars(VALUE str, int wantarray)
     long i, len, n;
     const char *ptr;
     rb_encoding *enc;
-    VALUE ary;
+    VALUE UNINITIALIZED_VAR(ary);
 
     if (rb_block_given_p()) {
 	if (wantarray) {
@@ -6494,7 +6494,7 @@ rb_str_enumerate_codepoints(VALUE str, int wantarray)
     unsigned int c;
     const char *ptr, *end;
     rb_encoding *enc;
-    VALUE ary;
+    VALUE UNINITIALIZED_VAR(ary);
 
     if (single_byte_optimizable(str))
 	return rb_str_enumerate_bytes(str, wantarray);