diff --git a/ChangeLog b/ChangeLog
index 3674a97c46..bdcece2a86 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Apr 14 11:24:56 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/-test-/printf/printf.c (uint_to_str): renamed to get rid of
+	  conflict on cygwin.  [ruby-core:68877] [Bug #11065]
+
 Tue Apr 14 08:59:04 2015  Zachary Scott  <e@zzak.io>
 
         * gc.c: [DOC] Improve documentation for ObjectSpace.count_objects
diff --git a/ext/-test-/printf/printf.c b/ext/-test-/printf/printf.c
index ef7570f426..666f5592e5 100644
--- a/ext/-test-/printf/printf.c
+++ b/ext/-test-/printf/printf.c
@@ -20,7 +20,7 @@ printf_test_q(VALUE self, VALUE obj)
 }
 
 static char *
-utoa(char *p, char *e, unsigned int x)
+uint_to_str(char *p, char *e, unsigned int x)
 {
     char *e0 = e;
     if (e <= p) return p;
@@ -71,12 +71,12 @@ printf_test_call(int argc, VALUE *argv, VALUE self)
 	    *p++ = '0';
 	}
 	if (!NIL_P(v = rb_hash_aref(opt, ID2SYM(rb_intern("width"))))) {
-	    p = utoa(p, format + sizeof(format), NUM2UINT(v));
+	    p = uint_to_str(p, format + sizeof(format), NUM2UINT(v));
 	}
 	if (!NIL_P(v = rb_hash_aref(opt, ID2SYM(rb_intern("prec"))))) {
 	    *p++ = '.';
 	    if (FIXNUM_P(v))
-		p = utoa(p, format + sizeof(format), NUM2UINT(v));
+		p = uint_to_str(p, format + sizeof(format), NUM2UINT(v));
 	}
     }
     *p++ = cnv;