diff --git a/mk2rbc/expr.go b/mk2rbc/expr.go
index 915f69e..0bb8b95 100644
--- a/mk2rbc/expr.go
+++ b/mk2rbc/expr.go
@@ -516,6 +516,7 @@
 }
 
 func (cx *callExpr) emit(gctx *generationContext) {
+	sep := ""
 	if cx.object != nil {
 		gctx.write("(")
 		cx.object.emit(gctx)
@@ -530,8 +531,14 @@
 			panic(fmt.Errorf("callExpr for %q should not be there", cx.name))
 		}
 		gctx.write(kf.runtimeName, "(")
+		if kf.hiddenArg == hiddenArgGlobal {
+			gctx.write("g")
+			sep = ", "
+		} else if kf.hiddenArg == hiddenArgConfig {
+			gctx.write("cfg")
+			sep = ", "
+		}
 	}
-	sep := ""
 	for _, arg := range cx.args {
 		gctx.write(sep)
 		arg.emit(gctx)