diff --git a/sources/ui/Cairo++.h b/sources/ui/Cairo++.h
index 50e0b3c..ccab778 100644
--- a/sources/ui/Cairo++.h
+++ b/sources/ui/Cairo++.h
@@ -1,6 +1,7 @@
 #pragma once
 #include "Geometry.h"
 #include "Color.h"
+#include <stdint.h>
 #include <cairo/cairo.h>
 #include <type_traits>
 #include <memory>
diff --git a/sources/ui/Color.h b/sources/ui/Color.h
index 5c27804..2cf2a28 100644
--- a/sources/ui/Color.h
+++ b/sources/ui/Color.h
@@ -1,4 +1,5 @@
 #pragma once
+#include <stdint.h>
 
 struct ColorRGBA8 {
     uint8_t r, g, b, a;
diff --git a/sources/ui/components/KnobSkin.hpp b/sources/ui/components/KnobSkin.hpp
index c124817..ef99e91 100644
--- a/sources/ui/components/KnobSkin.hpp
+++ b/sources/ui/components/KnobSkin.hpp
@@ -1,4 +1,5 @@
 #pragma once
+#include <stdint.h>
 #include "ui/Cairo++.h"
 
 class KnobSkin {