diff --git a/min/lib/Minify/CSS/UriRewriter.php b/min/lib/Minify/CSS/UriRewriter.php
index 8845f15..e1c67ed 100644
--- a/min/lib/Minify/CSS/UriRewriter.php
+++ b/min/lib/Minify/CSS/UriRewriter.php
@@ -284,6 +284,7 @@ class Minify_CSS_UriRewriter {
         }
         // analyze URI
         if ('/' !== $uri[0]                  // root-relative
+            && 0 !== strpos($uri, 'about:blank') //about:blank
             && false === strpos($uri, '//')  // protocol (non-data)
             && 0 !== strpos($uri, 'data:')   // data protocol
         ) {
diff --git a/min_unit_tests/_test_files/css_uriRewriter/exp.css b/min_unit_tests/_test_files/css_uriRewriter/exp.css
index d749295..8a30a2d 100644
--- a/min_unit_tests/_test_files/css_uriRewriter/exp.css
+++ b/min_unit_tests/_test_files/css_uriRewriter/exp.css
@@ -11,4 +11,6 @@
 foo {background:url('/_test_files/css_uriRewriter/bar/foo.png')}
 foo {background:url('http://foo.com/css/foo.css');} /* abs, should not alter */
 foo {background:url("//foo.com/css/foo.css");} /* protocol relative, should not alter */
-foo {background:url(data:image/gif;base64,AAAA);} /* data, should not alter */
\ No newline at end of file
+foo {background:url(data:image/gif;base64,AAAA);} /* data, should not alter */
+foo {background:url(about:blank);} /* about:blank, should not alter */
+foo {background:url(about:blank#tab-a);} /* about:blank with a fragment identifier, should not alter */
diff --git a/min_unit_tests/_test_files/css_uriRewriter/exp_prepend.css b/min_unit_tests/_test_files/css_uriRewriter/exp_prepend.css
index 87b7ecb..251c593 100644
--- a/min_unit_tests/_test_files/css_uriRewriter/exp_prepend.css
+++ b/min_unit_tests/_test_files/css_uriRewriter/exp_prepend.css
@@ -11,4 +11,6 @@
 foo {background:url('http://cnd.com/A/B/bar/foo.png')}
 foo {background:url('http://foo.com/css/foo.css');} /* abs, should not alter */
 foo {background:url("//foo.com/css/foo.css");} /* protocol relative, should not alter */
-foo {background:url(data:image/gif;base64,AAAA);} /* data, should not alter */
\ No newline at end of file
+foo {background:url(data:image/gif;base64,AAAA);} /* data, should not alter */
+foo {background:url(about:blank);} /* about:blank, should not alter */
+foo {background:url(about:blank#tab-a);} /* about:blank with a fragment identifier, should not alter */
diff --git a/min_unit_tests/_test_files/css_uriRewriter/exp_prepend2.css b/min_unit_tests/_test_files/css_uriRewriter/exp_prepend2.css
index ceea4ec..3460cfb 100644
--- a/min_unit_tests/_test_files/css_uriRewriter/exp_prepend2.css
+++ b/min_unit_tests/_test_files/css_uriRewriter/exp_prepend2.css
@@ -11,4 +11,4 @@
 foo {background:url('//cnd.com/A/B/bar/foo.png')}
 foo {background:url('http://foo.com/css/foo.css');} /* abs, should not alter */
 foo {background:url("//foo.com/css/foo.css");} /* protocol relative, should not alter */
-foo {background:url(data:image/gif;base64,AAAA);} /* data, should not alter */
\ No newline at end of file
+foo {background:url(data:image/gif;base64,AAAA);} /* data, should not alter */
diff --git a/min_unit_tests/_test_files/css_uriRewriter/in.css b/min_unit_tests/_test_files/css_uriRewriter/in.css
index aa41d0a..df80a22 100644
--- a/min_unit_tests/_test_files/css_uriRewriter/in.css
+++ b/min_unit_tests/_test_files/css_uriRewriter/in.css
@@ -11,4 +11,6 @@
 foo {background:url('bar/foo.png')}
 foo {background:url('http://foo.com/css/foo.css');} /* abs, should not alter */
 foo {background:url("//foo.com/css/foo.css");} /* protocol relative, should not alter */
-foo {background:url(data:image/gif;base64,AAAA);} /* data, should not alter */
\ No newline at end of file
+foo {background:url(data:image/gif;base64,AAAA);} /* data, should not alter */
+foo {background:url(about:blank);} /* about:blank, should not alter */
+foo {background:url(about:blank#tab-a);} /* about:blank with a fragment identifier, should not alter */