diff --git a/ujit_codegen.h b/ujit_codegen.h
index 26b97bbc2a..a3fd53a154 100644
--- a/ujit_codegen.h
+++ b/ujit_codegen.h
@@ -5,8 +5,8 @@
 #include "ujit_core.h"
 
 // Code blocks we generate code into
-codeblock_t* cb;
-codeblock_t* ocb;
+extern codeblock_t *cb;
+extern codeblock_t *ocb;
 
 // Code generation state
 typedef struct JITState