--- a/ntpclient.c
+++ b/ntpclient.c
@@ -43,6 +43,9 @@
 #include <errno.h>
 #ifdef PRECISION_SIOCGSTAMP
 #include <sys/ioctl.h>
+#ifdef __GLIBC__
+#include <linux/sockios.h>
+#endif
 #endif
 #ifdef USE_OBSOLETE_GETTIMEOFDAY
 #include <sys/time.h>
