diff --git a/src/common.h b/src/common.h
index cd2a13869c..9e6435a3df 100644
--- a/src/common.h
+++ b/src/common.h
@@ -32,6 +32,8 @@
 
 #if defined(__i386__) || defined(_M_IX86)
 #define PLATFORM_X86
+#else
+#define NO_RCT2 1
 #endif
 
 #if defined(__LP64__) || defined(_WIN64)