-#define HTTP_MSEC(s) (s * HTTP_MLLISEC)
-#define HTTP_USEC(s) (s * HTTP_MCROSEC)
-#define HTTP_NSEC(s) (s * HTTP_NANOSEC)
+#define HTTP_MSEC(s) ((long)(s * HTTP_MLLISEC))
+#define HTTP_USEC(s) ((long)(s * HTTP_MCROSEC))
+#define HTTP_NSEC(s) ((long)(s * HTTP_NANOSEC))