diff --git a/include/tug/Core/Numeric/SimulationInput.hpp b/include/tug/Core/Numeric/SimulationInput.hpp
index 202619c..d68effc 100644
--- a/include/tug/Core/Numeric/SimulationInput.hpp
+++ b/include/tug/Core/Numeric/SimulationInput.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <cstdint>
 #include <tug/Boundary.hpp>
 #include <tug/Core/Matrix.hpp>
 
@@ -18,4 +19,4 @@ template <typename T> struct SimulationInput {
   const T deltaRow;
   const T deltaCol;
 };
-} // namespace tug
\ No newline at end of file
+} // namespace tug