diff --git a/src/ripple/basics/MathUtilities.h b/src/ripple/basics/MathUtilities.h
index f9dbcbbbc3..4e8e3751cd 100644
--- a/src/ripple/basics/MathUtilities.h
+++ b/src/ripple/basics/MathUtilities.h
@@ -21,7 +21,7 @@
 #define RIPPLE_BASICS_MATHUTILITIES_H_INCLUDED
 
 #include <algorithm>
-#include <assert.h>
+#include <cassert>
 #include <cstddef>
 
 namespace ripple {
diff --git a/src/ripple/beast/utility/rngfill.h b/src/ripple/beast/utility/rngfill.h
index cf8b7bbeb4..71f434bdaf 100644
--- a/src/ripple/beast/utility/rngfill.h
+++ b/src/ripple/beast/utility/rngfill.h
@@ -21,6 +21,7 @@
 #define BEAST_RANDOM_RNGFILL_H_INCLUDED
 
 #include <array>
+#include <cassert>
 #include <cstdint>
 #include <cstring>
 #include <type_traits>