diff --git a/src/sbbs3/atcodes.cpp b/src/sbbs3/atcodes.cpp
index 8745838651f6dc399111dc1f2cfd00ceace466a4..3636df7d3e126a4afa982f50268827b74f931b2b 100644
--- a/src/sbbs3/atcodes.cpp
+++ b/src/sbbs3/atcodes.cpp
@@ -38,7 +38,7 @@
 #include "sbbs.h"
 #include "cmdshell.h"
 
-extern const char* beta_version;
+extern "C" const char* beta_version;
 
 /****************************************************************************/
 /* Returns 0 if invalid @ code. Returns length of @ code if valid.          */