diff --git a/src/build.cpp b/src/build.cpp
index c1b425f..5f3d88f 100644
--- a/src/build.cpp
+++ b/src/build.cpp
@@ -5,9 +5,9 @@
 
 #include "fs.hpp"
 #include <sstream>
-#include <stddef.h>
+#include <cstddef>
 #include <stdexcept>
-#include <stdlib.h>
+#include <cstdlib>
 #include <system_error>
 
 namespace cmkr {
@@ -94,4 +94,4 @@ int cmkr_build_install(void) {
     } catch (...) {
         return cmkr::error::Status(cmkr::error::Status::Code::InstallError);
     }
-}
\ No newline at end of file
+}
diff --git a/src/error.cpp b/src/error.cpp
index a8d2552..853b814 100644
--- a/src/error.cpp
+++ b/src/error.cpp
@@ -1,6 +1,6 @@
 #include "error.hpp"
 
-#include <assert.h>
+#include <cassert>
 
 namespace cmkr {
 namespace error {