diff --git a/src/client/host.c b/src/client/host.c
index ea4ca5da..00c91ceb 100644
--- a/src/client/host.c
+++ b/src/client/host.c
@@ -34,6 +34,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/types.h>
 #ifndef _WIN32
 #include <arpa/inet.h>
diff --git a/src/client/ioqueue.c b/src/client/ioqueue.c
index ec04c41c..be4542bb 100644
--- a/src/client/ioqueue.c
+++ b/src/client/ioqueue.c
@@ -33,6 +33,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/types.h>
 #ifndef _WIN32
 #include <sys/uio.h>
diff --git a/src/client/main.c b/src/client/main.c
index 00d2ddeb..cf16a6ac 100644
--- a/src/client/main.c
+++ b/src/client/main.c
@@ -43,6 +43,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/types.h>
 #ifndef _WIN32
 #include <pwd.h>
diff --git a/src/client/servcmd.c b/src/client/servcmd.c
index ae4976c5..3bc04c56 100644
--- a/src/client/servcmd.c
+++ b/src/client/servcmd.c
@@ -39,6 +39,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <ctype.h>
 #include <fcntl.h>
 #if !defined(_WIN32)
diff --git a/src/client/termio.c b/src/client/termio.c
index 6a597efd..10760706 100644
--- a/src/client/termio.c
+++ b/src/client/termio.c
@@ -33,6 +33,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/types.h>
 #if defined(aix) || defined(hpux) || defined(sgi)
 #include <sys/termio.h>
diff --git a/src/client/termlib.c b/src/client/termlib.c
index bc4f72a8..86ff0c37 100644
--- a/src/client/termlib.c
+++ b/src/client/termlib.c
@@ -34,6 +34,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <ctype.h>
 #include "misc.h"