diff --git a/colour_extractor.h b/colour_extractor.h
index 90ef18e..0eea735 100644
--- a/colour_extractor.h
+++ b/colour_extractor.h
@@ -1,7 +1,7 @@
 #ifndef COLOUR_EXTRACTOR_H_
 #define COLOUR_EXTRACTOR_H_
 
-#include <stdint.h>
+#include <stddef.h>
 
 #include "colours.h"