diff --git a/src/libpisp/backend/backend.hpp b/src/libpisp/backend/backend.hpp
index fde0ef4..6b29213 100644
--- a/src/libpisp/backend/backend.hpp
+++ b/src/libpisp/backend/backend.hpp
@@ -7,6 +7,7 @@
  */
 #pragma once
 
+#include <cstdint>
 #include <string>
 #include <type_traits>
 #include <utility>
diff --git a/src/libpisp/common/pisp_utils.cpp b/src/libpisp/common/pisp_utils.cpp
index 83e6bf5..00e0bc0 100644
--- a/src/libpisp/common/pisp_utils.cpp
+++ b/src/libpisp/common/pisp_utils.cpp
@@ -4,6 +4,8 @@
  *
  * pisp_utils.cpp - PiSP buffer helper utilities
  */
+#include <cstdint>
+
 #include "backend/pisp_be_config.h"
 
 #include "pisp_common.h"