diff --git a/include/internal/catch_test_case_tracker.cpp b/include/internal/catch_test_case_tracker.cpp
index 66da89e3..8502b405 100644
--- a/include/internal/catch_test_case_tracker.cpp
+++ b/include/internal/catch_test_case_tracker.cpp
@@ -10,7 +10,7 @@
 #include "catch_enforce.h"
 
 #include <algorithm>
-#include <assert.h>
+#include <cassert>
 #include <stdexcept>
 #include <memory>
 #include <sstream>
diff --git a/include/reporters/catch_reporter_bases.cpp b/include/reporters/catch_reporter_bases.cpp
index c2059b5a..4dd4f95d 100644
--- a/include/reporters/catch_reporter_bases.cpp
+++ b/include/reporters/catch_reporter_bases.cpp
@@ -13,7 +13,7 @@
 #include <cstring>
 #include <cfloat>
 #include <cstdio>
-#include <assert.h>
+#include <cassert>
 #include <memory>
 
 namespace Catch {
diff --git a/include/reporters/catch_reporter_bases.hpp b/include/reporters/catch_reporter_bases.hpp
index 7b66ea05..f198d214 100644
--- a/include/reporters/catch_reporter_bases.hpp
+++ b/include/reporters/catch_reporter_bases.hpp
@@ -14,7 +14,7 @@
 #include <cstring>
 #include <cfloat>
 #include <cstdio>
-#include <assert.h>
+#include <cassert>
 #include <memory>
 #include <ostream>
 
diff --git a/include/reporters/catch_reporter_junit.cpp b/include/reporters/catch_reporter_junit.cpp
index d133b700..55129b76 100644
--- a/include/reporters/catch_reporter_junit.cpp
+++ b/include/reporters/catch_reporter_junit.cpp
@@ -13,7 +13,7 @@
 #include "../internal/catch_tostring.h"
 #include "../internal/catch_reporter_registrars.hpp"
 
-#include <assert.h>
+#include <cassert>
 #include <sstream>
 #include <ctime>
 #include <algorithm>