diff --git a/src/node_data.cpp b/src/node_data.cpp
index 6cfedfc..f0c776d 100644
--- a/src/node_data.cpp
+++ b/src/node_data.cpp
@@ -1,4 +1,4 @@
-#include <assert.h>
+#include <cassert>
 #include <iterator>
 #include <sstream>
 
diff --git a/src/nodebuilder.cpp b/src/nodebuilder.cpp
index c90a66c..171afd8 100644
--- a/src/nodebuilder.cpp
+++ b/src/nodebuilder.cpp
@@ -1,4 +1,3 @@
-#include <assert.h>
 #include <cassert>
 
 #include "nodebuilder.h"