diff --git a/src/checkclass.cpp b/src/checkclass.cpp
index acddda1c0..983439613 100644
--- a/src/checkclass.cpp
+++ b/src/checkclass.cpp
@@ -24,6 +24,7 @@
 
 #include <locale>
 
+#include <cstring>
 #include <string>
 #include <sstream>
 #include <algorithm>
diff --git a/src/checkmemoryleak.cpp b/src/checkmemoryleak.cpp
index dbfb77990..8970aaac1 100644
--- a/src/checkmemoryleak.cpp
+++ b/src/checkmemoryleak.cpp
@@ -22,6 +22,7 @@
 #include "errormessage.h"
 
 #include <algorithm>
+#include <cstring>
 #include <iostream>
 #include <sstream>
 
diff --git a/src/filelister.cpp b/src/filelister.cpp
index 0f8a77335..421ccb384 100644
--- a/src/filelister.cpp
+++ b/src/filelister.cpp
@@ -20,6 +20,7 @@
 #include "filelister.h"
 #include <sstream>
 #include <vector>
+#include <cstring>
 #include <string>
 #include <cctype>
 #include <algorithm>