diff --git a/tgt-pcb/scope.cc b/tgt-pcb/scope.cc
index 0ea50a995..d9ae6a0cc 100644
--- a/tgt-pcb/scope.cc
+++ b/tgt-pcb/scope.cc
@@ -86,7 +86,7 @@ int scan_scope(ivl_scope_t scope)
       return 0;
 }
 
-static int child_scan_fun(ivl_scope_t scope, void*)
+extern "C" int child_scan_fun(ivl_scope_t scope, void*)
 {
       int rc = scan_scope(scope);
       return 0;