diff --git a/src/dmm/metex14.c b/src/dmm/metex14.c
index 5db28cb9..e2d14ec3 100644
--- a/src/dmm/metex14.c
+++ b/src/dmm/metex14.c
@@ -31,6 +31,7 @@
  */
 
 #include <string.h>
+#include <strings.h>
 #include <ctype.h>
 #include <math.h>
 #include <glib.h>
diff --git a/src/hardware/rigol-ds/api.c b/src/hardware/rigol-ds/api.c
index b860c11b..7a195bb7 100644
--- a/src/hardware/rigol-ds/api.c
+++ b/src/hardware/rigol-ds/api.c
@@ -23,6 +23,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <math.h>
 #include <glib.h>
 #include "libsigrok.h"
diff --git a/src/hardware/scpi-pps/api.c b/src/hardware/scpi-pps/api.c
index 9da52579..e68836b7 100644
--- a/src/hardware/scpi-pps/api.c
+++ b/src/hardware/scpi-pps/api.c
@@ -18,6 +18,7 @@
  */
 
 #include <string.h>
+#include <strings.h>
 #include "protocol.h"
 
 SR_PRIV struct sr_dev_driver scpi_pps_driver_info;
diff --git a/src/hardware/scpi-pps/profiles.c b/src/hardware/scpi-pps/profiles.c
index 50d7d93a..1252234d 100644
--- a/src/hardware/scpi-pps/profiles.c
+++ b/src/hardware/scpi-pps/profiles.c
@@ -18,6 +18,7 @@
  */
 
 #include <string.h>
+#include <strings.h>
 #include "protocol.h"
 
 #define CH_IDX(x) (1 << x)
diff --git a/src/hardware/scpi-pps/protocol.c b/src/hardware/scpi-pps/protocol.c
index be478860..df7d478d 100644
--- a/src/hardware/scpi-pps/protocol.c
+++ b/src/hardware/scpi-pps/protocol.c
@@ -18,6 +18,7 @@
  */
 
 #include <string.h>
+#include <strings.h>
 #include <stdarg.h>
 #include "protocol.h"
 
diff --git a/src/strutil.c b/src/strutil.c
index 131126b0..ae2b7dd3 100644
--- a/src/strutil.c
+++ b/src/strutil.c
@@ -21,6 +21,7 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <errno.h>
 #include "libsigrok.h"
 #include "libsigrok-internal.h"