diff --git a/src/cmd/compile/internal/gc/typecheck.go b/src/cmd/compile/internal/gc/typecheck.go
index 94ae32ec2c..1a8056a2a4 100644
--- a/src/cmd/compile/internal/gc/typecheck.go
+++ b/src/cmd/compile/internal/gc/typecheck.go
@@ -3095,7 +3095,7 @@ func typecheckcomplit(n *Node) *Node {
 
 				f := lookdot1(nil, l.Sym, t, t.Fields(), 0)
 				if f == nil {
-					yyerror("unknown %v field '%v' in struct literal", t, l.Sym)
+					yyerror("unknown field '%v' in struct literal of type %v", l.Sym, t)
 					continue
 				}
 				fielddup(f.Sym.Name, hash)
diff --git a/test/fixedbugs/issue14136.go b/test/fixedbugs/issue14136.go
index 928a60bf6b..f9efd05f96 100644
--- a/test/fixedbugs/issue14136.go
+++ b/test/fixedbugs/issue14136.go
@@ -14,6 +14,6 @@ package main
 type T struct{}
 
 func main() {
-	t := T{X: 1, X: 1, X: 1, X: 1, X: 1, X: 1, X: 1, X: 1, X: 1, X: 1} // ERROR "unknown T field"
+	t := T{X: 1, X: 1, X: 1, X: 1, X: 1, X: 1, X: 1, X: 1, X: 1, X: 1} // ERROR "unknown field 'X' in struct literal of type T"
 	var s string = 1 // ERROR "cannot use 1"
 }
diff --git a/test/fixedbugs/issue17631.go b/test/fixedbugs/issue17631.go
new file mode 100644
index 0000000000..79b7e8a751
--- /dev/null
+++ b/test/fixedbugs/issue17631.go
@@ -0,0 +1,22 @@
+// errorcheck
+
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import "time"
+
+func main() {
+	_ = struct {
+		about      string
+		before     map[string]uint
+		update     map[string]int
+		updateTime time.Time
+		expect     map[string]int
+	}{
+		about:   "this one",
+		updates: map[string]int{"gopher": 10}, // ERROR "unknown field 'updates' in struct literal of type"
+	}
+}