diff --git a/lib/actions.c b/lib/actions.c
index 6a9a48ff..5e50dbe5 100644
--- a/lib/actions.c
+++ b/lib/actions.c
@@ -16,6 +16,8 @@ Contributors:
 
 #include "config.h"
 
+#include <string.h>
+
 #include "mosquitto.h"
 #include "mosquitto_internal.h"
 #include "memory_mosq.h"
diff --git a/lib/loop.c b/lib/loop.c
index 9c259790..902e35ce 100644
--- a/lib/loop.c
+++ b/lib/loop.c
@@ -17,6 +17,7 @@ Contributors:
 #include "config.h"
 
 #include <errno.h>
+#include <sys/select.h>
 
 #include "mosquitto.h"
 #include "mosquitto_internal.h"
diff --git a/lib/mosquitto.c b/lib/mosquitto.c
index 65b2278e..d5f35043 100644
--- a/lib/mosquitto.c
+++ b/lib/mosquitto.c
@@ -18,6 +18,8 @@ Contributors:
 
 #include <errno.h>
 #include <signal.h>
+#include <string.h>
+#include <sys/time.h>
 
 #include "mosquitto.h"
 #include "mosquitto_internal.h"