diff --git a/Makefile b/Makefile
index fc9b3714..93ba120f 100644
--- a/Makefile
+++ b/Makefile
@@ -61,6 +61,7 @@ LIB_SOURCES =	src/libhttp.c						\
 		src/httplib_construct_etag.c				\
 		src/httplib_consume_socket.c				\
 		src/httplib_delete_file.c				\
+		src/httplib_difftimespec.c				\
 		src/httplib_dir_scan_callback.c				\
 		src/httplib_discard_unread_request_data.c		\
 		src/httplib_download.c					\
diff --git a/src/httplib_difftimespec.c b/src/httplib_difftimespec.c
new file mode 100644
index 00000000..c263232c
--- /dev/null
+++ b/src/httplib_difftimespec.c
@@ -0,0 +1,36 @@
+/* 
+ * Copyright (c) 2016 Lammert Bies
+ * Copyright (c) 2013-2016 the Civetweb developers
+ * Copyright (c) 2004-2013 Sergey Lyubka
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+
+
+#include "libhttp-private.h"
+
+
+/* difftime for struct timespec. Return value is in seconds. */
+double XX_httplib_difftimespec(const struct timespec *ts_now, const struct timespec *ts_before) {
+
+	return (double)(ts_now->tv_nsec - ts_before->tv_nsec) * 1.0E-9
+	       + (double)(ts_now->tv_sec - ts_before->tv_sec);
+
+}  /* XX_httplib_difftimespec */
diff --git a/src/libhttp.c b/src/libhttp.c
index c8b558ba..31907d1d 100644
--- a/src/libhttp.c
+++ b/src/libhttp.c
@@ -827,14 +827,6 @@ void XX_httplib_set_thread_name(const char *threadName) {
 #endif
 
 
-/* difftime for struct timespec. Return value is in seconds. */
-double XX_httplib_difftimespec(const struct timespec *ts_now, const struct timespec *ts_before) {
-
-	return (double)(ts_now->tv_nsec - ts_before->tv_nsec) * 1.0E-9
-	       + (double)(ts_now->tv_sec - ts_before->tv_sec);
-
-}  /* XX_httplib_difftimespec */
-
 
 /* Print error message to the opened error log stream. */
 void mg_cry(const struct mg_connection *conn, const char *fmt, ...) {