diff --git a/src/history.cpp b/src/history.cpp
index d5632986..52e36219 100644
--- a/src/history.cpp
+++ b/src/history.cpp
@@ -23,6 +23,7 @@
 ////
 
 #include <cassert>
+#include <cstring>
 
 #include "history.h"
 
diff --git a/src/material.cpp b/src/material.cpp
index 9f0fb9ed..595eee29 100644
--- a/src/material.cpp
+++ b/src/material.cpp
@@ -23,6 +23,7 @@
 ////
 
 #include <cassert>
+#include <cstring>
 #include <map>
 
 #include "material.h"
diff --git a/src/pawns.cpp b/src/pawns.cpp
index 0089c42d..6fdd5c13 100644
--- a/src/pawns.cpp
+++ b/src/pawns.cpp
@@ -23,6 +23,7 @@
 ////
 
 #include <cassert>
+#include <cstring>
 
 #include "pawns.h"
 
diff --git a/src/square.h b/src/square.h
index ff31e865..ed0b289b 100644
--- a/src/square.h
+++ b/src/square.h
@@ -25,6 +25,7 @@
 //// Includes
 ////
 
+#include <cstdlib> // for abs()
 #include <string>
 
 #include "color.h"
diff --git a/src/tt.cpp b/src/tt.cpp
index 4ac685d5..97ca23dc 100644
--- a/src/tt.cpp
+++ b/src/tt.cpp
@@ -24,6 +24,7 @@
 
 #include <cassert>
 #include <cmath>
+#include <cstring>
 
 #include "tt.h"