diff --git a/lib/libkvm/kvm_amd64.c b/lib/libkvm/kvm_amd64.c
index 462447946954..36b353be353b 100644
--- a/lib/libkvm/kvm_amd64.c
+++ b/lib/libkvm/kvm_amd64.c
@@ -51,6 +51,7 @@ static char sccsid[] = "@(#)kvm_hp300.c	8.1 (Berkeley) 6/4/93";
 #include <sys/stat.h>
 #include <sys/mman.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <nlist.h>
 #include <kvm.h>
diff --git a/lib/libkvm/kvm_arm.c b/lib/libkvm/kvm_arm.c
index 489cfe0545a4..daef795a1a8d 100644
--- a/lib/libkvm/kvm_arm.c
+++ b/lib/libkvm/kvm_arm.c
@@ -52,6 +52,7 @@ __FBSDID("$FreeBSD$");
 #include <limits.h>
 #include <kvm.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 
 #include "kvm_private.h"
diff --git a/lib/libkvm/kvm_cptime.c b/lib/libkvm/kvm_cptime.c
index 53dcdf34288c..5b7eefa1f23b 100644
--- a/lib/libkvm/kvm_cptime.c
+++ b/lib/libkvm/kvm_cptime.c
@@ -39,6 +39,7 @@ __FBSDID("$FreeBSD$");
 #include <kvm.h>
 #include <limits.h>
 #include <stdlib.h>
+#include <string.h>
 
 #include "kvm_private.h"
 
diff --git a/lib/libkvm/kvm_file.c b/lib/libkvm/kvm_file.c
index 024ccb2ffe70..4d41bfca1f8c 100644
--- a/lib/libkvm/kvm_file.c
+++ b/lib/libkvm/kvm_file.c
@@ -61,6 +61,7 @@ static char sccsid[] = "@(#)kvm_file.c	8.1 (Berkeley) 6/4/93";
 #include <limits.h>
 #include <ndbm.h>
 #include <paths.h>
+#include <stdlib.h>
 
 #include "kvm_private.h"
 
diff --git a/lib/libkvm/kvm_i386.c b/lib/libkvm/kvm_i386.c
index 523cfa684f3d..303b4af4ac32 100644
--- a/lib/libkvm/kvm_i386.c
+++ b/lib/libkvm/kvm_i386.c
@@ -51,6 +51,7 @@ static char sccsid[] = "@(#)kvm_hp300.c	8.1 (Berkeley) 6/4/93";
 #include <sys/stat.h>
 #include <sys/mman.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <nlist.h>
 #include <kvm.h>
diff --git a/lib/libkvm/kvm_minidump_amd64.c b/lib/libkvm/kvm_minidump_amd64.c
index f3ac855dad19..8f48f98b35e9 100644
--- a/lib/libkvm/kvm_minidump_amd64.c
+++ b/lib/libkvm/kvm_minidump_amd64.c
@@ -37,7 +37,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/mman.h>
 #include <sys/fnv_hash.h>
 #include <stdlib.h>
-#include <strings.h>
+#include <string.h>
 #include <unistd.h>
 #include <nlist.h>
 #include <kvm.h>
diff --git a/lib/libkvm/kvm_minidump_i386.c b/lib/libkvm/kvm_minidump_i386.c
index 8e074cb07993..0d317055ad07 100644
--- a/lib/libkvm/kvm_minidump_i386.c
+++ b/lib/libkvm/kvm_minidump_i386.c
@@ -37,7 +37,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/mman.h>
 #include <sys/fnv_hash.h>
 #include <stdlib.h>
-#include <strings.h>
+#include <string.h>
 #include <unistd.h>
 #include <nlist.h>
 #include <kvm.h>