diff --git a/libf2c/ChangeLog b/libf2c/ChangeLog
index 0b6e261d3bc..0308ccfe028 100644
--- a/libf2c/ChangeLog
+++ b/libf2c/ChangeLog
@@ -1,3 +1,7 @@
+2001-01-23  Michael Sokolov  <msokolov@ivan.Harhan.ORG>
+
+	* libU77/sys_clock_.c: #include <sys/param.h> for the clock tick rate.
+
 2000-12-09  Toon Moene  <toon@moene.indiv.nluug.nl>
 
 	Update to Netlib version 20001205.
diff --git a/libf2c/libU77/sys_clock_.c b/libf2c/libU77/sys_clock_.c
index d0d2a77049a..111d2ba63fa 100644
--- a/libf2c/libU77/sys_clock_.c
+++ b/libf2c/libU77/sys_clock_.c
@@ -19,6 +19,9 @@ Boston, MA 02111-1307, USA.  */
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
+#if HAVE_SYS_PARAM_H
+# include <sys/param.h>
+#endif
 #if TIME_WITH_SYS_TIME
 # include <sys/time.h>
 # include <time.h>