diff --git a/toolbox/ionice.c b/toolbox/ionice.c
index 4a182f2..7abc261 100644
--- a/toolbox/ionice.c
+++ b/toolbox/ionice.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <errno.h>
 
diff --git a/toolbox/lsof.c b/toolbox/lsof.c
index bee981d..982f5aa 100644
--- a/toolbox/lsof.c
+++ b/toolbox/lsof.c
@@ -35,6 +35,7 @@
 #include <libgen.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 
 #include <pwd.h>
diff --git a/toolbox/renice.c b/toolbox/renice.c
index 9dfeb51..99a06f4 100644
--- a/toolbox/renice.c
+++ b/toolbox/renice.c
@@ -32,6 +32,7 @@
 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/time.h>
 #include <sys/resource.h>
 #include <sched.h>
diff --git a/toolbox/restorecon.c b/toolbox/restorecon.c
index 3568625..cb5799e 100644
--- a/toolbox/restorecon.c
+++ b/toolbox/restorecon.c
@@ -1,6 +1,7 @@
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <errno.h>
 #include <selinux/selinux.h>
 #include <selinux/android.h>