diff --git a/apache2/msc_util.h b/apache2/msc_util.h
index 546d0a8f..40f225c0 100644
--- a/apache2/msc_util.h
+++ b/apache2/msc_util.h
@@ -45,6 +45,8 @@ int DSOLOCAL remove_lf_crlf_inplace(char *text);
 
 unsigned char DSOLOCAL x2c(unsigned char *what);
 
+unsigned char DSOLOCAL xsingle2c(unsigned char *what);
+
 char DSOLOCAL *guess_tmp_dir(apr_pool_t *p);
 
 char DSOLOCAL *current_logtime(apr_pool_t *mp);
@@ -90,4 +92,6 @@ int DSOLOCAL is_empty_string(const char *string);
 
 char DSOLOCAL *resolve_relative_path(apr_pool_t *pool, const char *parent_filename, const char *filename);
 
+int DSOLOCAL css_decode_inplace(unsigned char *input, long int input_len);
+
 #endif
diff --git a/apache2/re_tfns.c b/apache2/re_tfns.c
index 372c0de9..bf3d2b6c 100644
--- a/apache2/re_tfns.c
+++ b/apache2/re_tfns.c
@@ -198,6 +198,20 @@ static int msre_fn_compressWhitespace_execute(apr_pool_t *mptmp, unsigned char *
     return changed;
 }
 
+/* cssDecode */
+
+static int msre_fn_cssDecode_execute(apr_pool_t *mptmp, unsigned char *input,
+    long int input_len, char **rval, long int *rval_len)
+{
+    long int length;
+
+    length = css_decode_inplace(input, input_len);
+    *rval = (char *)input;
+    *rval_len = length;
+
+    return (*rval_len == input_len ? 0 : 1);
+}
+
 /* removeWhitespace */
 
 static int msre_fn_removeWhitespace_execute(apr_pool_t *mptmp, unsigned char *input,
@@ -612,6 +626,12 @@ void msre_engine_register_default_tfns(msre_engine *engine) {
         msre_fn_compressWhitespace_execute
     );
 
+    /* cssDecode */
+    msre_engine_tfn_register(engine,
+        "cssDecode",
+        msre_fn_cssDecode_execute
+    );
+
     /* escapeSeqDecode */
     msre_engine_tfn_register(engine,
         "escapeSeqDecode",