diff --git a/include/mir/MIR.h b/include/mir/MIR.h
index d0539bc..a773e1f 100644
--- a/include/mir/MIR.h
+++ b/include/mir/MIR.h
@@ -5,6 +5,7 @@
 #include <memory>
 #include <string>
 #include <vector>
+#include <cstdint>
 
 namespace ir {
 class Module;
@@ -300,4 +301,4 @@ void RunFrameLowering(MachineFunction& function);
 std::vector<std::unique_ptr<MachineFunction>> LowerToMIR(const ir::Module& module);
 void PrintAsm(const std::vector<std::unique_ptr<MachineFunction>>& functions, std::ostream& os);
 void RunPeepholeOptimization(MachineFunction& function);
-}  // namespace mir
\ No newline at end of file
+}  // namespace mir