diff --git a/src/cmd/compile/internal/gc/sinit.go b/src/cmd/compile/internal/gc/sinit.go
index 4469d71f1c5..72c06dde2d5 100644
--- a/src/cmd/compile/internal/gc/sinit.go
+++ b/src/cmd/compile/internal/gc/sinit.go
@@ -866,7 +866,7 @@ func maplit(ctxt int, n *Node, var_ *Node, init *Nodes) {
 	nerr := nerrors
 
 	a := Nod(OMAKE, nil, nil)
-	a.List.Set1(typenod(n.Type))
+	a.List.Set2(typenod(n.Type), Nodintconst(int64(len(n.List.Slice()))))
 	litas(var_, a, init)
 
 	// count the initializers
diff --git a/src/cmd/compile/internal/gc/syntax.go b/src/cmd/compile/internal/gc/syntax.go
index df9f838e772..58f95e82c98 100644
--- a/src/cmd/compile/internal/gc/syntax.go
+++ b/src/cmd/compile/internal/gc/syntax.go
@@ -545,6 +545,11 @@ func (n *Nodes) Set1(node *Node) {
 	n.slice = &[]*Node{node}
 }
 
+// Set2 sets n to a slice containing two nodes.
+func (n *Nodes) Set2(n1, n2 *Node) {
+	n.slice = &[]*Node{n1, n2}
+}
+
 // MoveNodes sets n to the contents of n2, then clears n2.
 func (n *Nodes) MoveNodes(n2 *Nodes) {
 	n.slice = n2.slice