diff --git a/src/cmd/compile/internal/gc/iimport.go b/src/cmd/compile/internal/gc/iimport.go
index 54c5d8dc2f..21151b5215 100644
--- a/src/cmd/compile/internal/gc/iimport.go
+++ b/src/cmd/compile/internal/gc/iimport.go
@@ -296,8 +296,23 @@ func (r *importReader) doDecl(n *Node) {
 		// declaration before recursing.
 		t := importtype(r.p.ipkg, pos, n.Sym)
 
+		// We also need to defer width calculations until
+		// after the underlying type has been assigned.
+		//
+		// TODO(mdempsky): Add nesting support directly to
+		// {defer,resume}checkwidth? Width calculations are
+		// already deferred during initial typechecking, but
+		// not when we're expanding inline function bodies, so
+		// we currently need to handle both cases here.
+		deferring := defercalc != 0
+		if !deferring {
+			defercheckwidth()
+		}
 		underlying := r.typ()
 		copytype(typenod(t), underlying)
+		if !deferring {
+			resumecheckwidth()
+		}
 
 		if underlying.IsInterface() {
 			break
@@ -576,6 +591,10 @@ func (r *importReader) typ1() *types.Type {
 		t := types.New(TINTER)
 		t.SetPkg(r.currPkg)
 		t.SetInterface(append(embeddeds, methods...))
+
+		// Ensure we expand the interface in the frontend (#25055).
+		checkwidth(t)
+
 		return t
 	}
 }
diff --git a/test/fixedbugs/issue25055.dir/a.go b/test/fixedbugs/issue25055.dir/a.go
new file mode 100644
index 0000000000..7fea195e2b
--- /dev/null
+++ b/test/fixedbugs/issue25055.dir/a.go
@@ -0,0 +1,7 @@
+// Copyright 2018 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 a
+
+var A chan *interface{}
diff --git a/test/fixedbugs/issue25055.dir/b.go b/test/fixedbugs/issue25055.dir/b.go
new file mode 100644
index 0000000000..01efeae3e6
--- /dev/null
+++ b/test/fixedbugs/issue25055.dir/b.go
@@ -0,0 +1,9 @@
+// Copyright 2018 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 b
+
+import "./a"
+
+var _ = <-a.A
diff --git a/test/fixedbugs/issue25055.go b/test/fixedbugs/issue25055.go
new file mode 100644
index 0000000000..0e15a8e71f
--- /dev/null
+++ b/test/fixedbugs/issue25055.go
@@ -0,0 +1,7 @@
+// compiledir -c=2
+
+// Copyright 2018 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 ignored