diff --git a/src/core/model/nstime.h b/src/core/model/nstime.h
index b985eea2a..bc43871b8 100644
--- a/src/core/model/nstime.h
+++ b/src/core/model/nstime.h
@@ -25,7 +25,7 @@
 #include "attribute-helper.h"
 #include "int64x64.h"
 #include <stdint.h>
-#include <limits.h>
+#include <climits>
 #include <cmath>
 #include <ostream>
 
diff --git a/utils/print-introspected-doxygen.cc b/utils/print-introspected-doxygen.cc
index 4db0f7215..caee94403 100644
--- a/utils/print-introspected-doxygen.cc
+++ b/utils/print-introspected-doxygen.cc
@@ -1,7 +1,6 @@
 #include <iostream>
 #include <algorithm>
 #include <map>
-#include <limits.h>
 
 #include "ns3/object.h"
 #include "ns3/pointer.h"