diff --git a/ctimez.c b/ctimez.c
index 21a529d..ecd5616 100644
--- a/ctimez.c
+++ b/ctimez.c
@@ -48,6 +48,7 @@ static char *rcsid="$Id: ctimez.c,v 1.7 1999/11/09 18:55:03 crosser Exp $";
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <stdio.h>
+#include <string.h>
 #if TIME_WITH_SYS_TIME
 # include <sys/time.h>
 # include <time.h>
diff --git a/eph_cmd.c b/eph_cmd.c
index 7f90ad6..462eff0 100644
--- a/eph_cmd.c
+++ b/eph_cmd.c
@@ -89,6 +89,7 @@ static char *rcsid="$Id: eph_cmd.c,v 1.20 2001/08/28 06:28:01 crosser Exp $";
 #include "config.h"
 #endif
 #include <stdio.h>
+#include <string.h>
 #include "eph_io.h"
 #include "eph_priv.h"
 
diff --git a/fnames.c b/fnames.c
index bf2db6d..8d19f4c 100644
--- a/fnames.c
+++ b/fnames.c
@@ -53,6 +53,7 @@ static char *rcsid="$Id: fnames.c,v 1.7 2001/01/11 06:49:57 crosser Exp $";
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <stdio.h>
+#include <string.h>
 #if TIME_WITH_SYS_TIME
 # include <sys/time.h>
 # include <time.h>