diff --git a/tools/pioasm/output_format.h b/tools/pioasm/output_format.h
index 405a5ae75..d42ea73b4 100644
--- a/tools/pioasm/output_format.h
+++ b/tools/pioasm/output_format.h
@@ -7,6 +7,7 @@
 #ifndef _OUTPUT_FORMAT_H
 #define _OUTPUT_FORMAT_H
 
+#include <cstdint>
 #include <vector>
 #include <map>
 #include <string>
@@ -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..755eb75a0 100644
--- a/tools/pioasm/pio_types.h
+++ b/tools/pioasm/pio_types.h
@@ -7,6 +7,7 @@
 #ifndef _PIO_TYPES_H
 #define _PIO_TYPES_H
 
+#include <cstdint>
 #include <string>
 #include <map>
 #include <set>