diff --git a/src/cmd/compile/internal/gc/go.go b/src/cmd/compile/internal/gc/go.go
index af9aaf0..87b6121 100644
--- a/src/cmd/compile/internal/gc/go.go
+++ b/src/cmd/compile/internal/gc/go.go
@@ -175,6 +175,9 @@
 
 var trackpkg *Pkg // fake package for field tracking
 
+var mappkg *Pkg // fake package for map zero value
+var zerosize int64
+
 var Tptr EType // either TPTR32 or TPTR64
 
 var myimportpath string