diff --git a/tools/pioasm/output_format.h b/tools/pioasm/output_format.h
index 405a5ae75..bed7f998d 100644
--- a/tools/pioasm/output_format.h
+++ b/tools/pioasm/output_format.h
@@ -11,6 +11,7 @@
 #include <map>
 #include <string>
 #include <memory>
+#include <cstdint>
 
 #include "pio_enums.h"
 
@@ -120,4 +121,4 @@ struct output_format {
     output_format(std::string name) : name(std::move(name)) {}
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/tools/pioasm/pio_types.h b/tools/pioasm/pio_types.h
index 9f9fb0e3e..d4ca5c753 100644
--- a/tools/pioasm/pio_types.h
+++ b/tools/pioasm/pio_types.h
@@ -13,6 +13,7 @@
 #include <utility>
 #include <vector>
 #include <memory>
+#include <cstdint>
 
 #include "location.h"
 #include "pio_enums.h"