diff --git a/Processors/65816/65816.hpp b/Processors/65816/65816.hpp
index 3843520c0..a08fd59c6 100644
--- a/Processors/65816/65816.hpp
+++ b/Processors/65816/65816.hpp
@@ -11,6 +11,7 @@
 
 #include <cassert>	// TEMPORARILY.
 #include <cstdint>
+#include <cstdio>	// TEMPORARILY.
 #include <vector>
 
 #include "../RegisterSizes.hpp"