diff --git a/Common/ArmEmitter.cpp b/Common/ArmEmitter.cpp
index 15d4572d23..dfecfc0587 100644
--- a/Common/ArmEmitter.cpp
+++ b/Common/ArmEmitter.cpp
@@ -20,6 +20,7 @@
 
 #include <assert.h>
 #include <stdarg.h>
+#include <stddef.h>
 
 // For cache flushing on Symbian/iOS/Blackberry
 #ifdef __SYMBIAN32__