diff --git a/common/get_unix_ns.h b/common/get_unix_ns.h
index 721b942..6fb6cec 100644
--- a/common/get_unix_ns.h
+++ b/common/get_unix_ns.h
@@ -3,6 +3,13 @@
 
 #include <gmodule.h>
 
+#ifdef _WIN32
+#define WIN32_LEAN_AND_MEAN
+#include <Windows.h>
+#endif
+
+
+#ifdef _WIN32
 typedef struct _MYFILETIME
 {
   guint32 dwLowDateTime;
@@ -39,5 +46,19 @@ get_unix_ns ()
   ltime.QuadPart -= 11644473600000 * 10000;
   return ltime.QuadPart * 100;
 }
+#endif /* _WIN32 */
+
+
+#ifdef __unix__
+static guint64
+get_unix_ns ()
+{
+  struct timespec spec;
+
+  clock_gettime (CLOCK_REALTIME, &spec);
+  return (guint64) spec.tv_sec * 1000000000L + (guint64) spec.tv_nsec;
+}
+#endif /* __unix__ */
+
 
 #endif /* _GET_UNIX_NS_H_ */
diff --git a/sys/gentl/gstgentlsrc.c b/sys/gentl/gstgentlsrc.c
index 7bc657c..259d2dc 100644
--- a/sys/gentl/gstgentlsrc.c
+++ b/sys/gentl/gstgentlsrc.c
@@ -34,9 +34,6 @@
 #include "config.h"
 #endif
 
-#define WIN32_LEAN_AND_MEAN
-#include <Windows.h>
-
 #include <gmodule.h>
 
 #include <gio/gio.h>