diff --git a/src/cmd/compile/internal/noder/stencil.go b/src/cmd/compile/internal/noder/stencil.go
index 25a4bf775f..8b5a91f6d1 100644
--- a/src/cmd/compile/internal/noder/stencil.go
+++ b/src/cmd/compile/internal/noder/stencil.go
@@ -558,7 +558,7 @@ func (g *irgen) genericSubst(newsym *types.Sym, nameNode *ir.Name, targs []*type
 	oldt := nameNode.Type()
 	// We also transform a generic method type to the corresponding
 	// instantiated function type where the dictionary is the first parameter.
-	dictionarySym := types.LocalPkg.Lookup(".dict")
+	dictionarySym := newsym.Pkg.Lookup(".dict")
 	dictionaryType := types.Types[types.TUINTPTR]
 	dictionaryName := ir.NewNameAt(gf.Pos(), dictionarySym)
 	typed(dictionaryType, dictionaryName)
diff --git a/test/typeparam/mutualimp.dir/a.go b/test/typeparam/mutualimp.dir/a.go
new file mode 100644
index 0000000000..56ca57cea5
--- /dev/null
+++ b/test/typeparam/mutualimp.dir/a.go
@@ -0,0 +1,11 @@
+// Copyright 2021 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
+
+type X int
+func (x X) M() X { return x }
+
+func F[T interface{ M() U }, U interface{ M() T }]() {}
+func G() { F[X, X]() }
diff --git a/test/typeparam/mutualimp.dir/b.go b/test/typeparam/mutualimp.dir/b.go
new file mode 100644
index 0000000000..83cc3af283
--- /dev/null
+++ b/test/typeparam/mutualimp.dir/b.go
@@ -0,0 +1,12 @@
+// Copyright 2021 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"
+
+func H() {
+	a.F[a.X, a.X]()
+	a.G()
+}
diff --git a/test/typeparam/mutualimp.go b/test/typeparam/mutualimp.go
new file mode 100644
index 0000000000..87b4ff46c1
--- /dev/null
+++ b/test/typeparam/mutualimp.go
@@ -0,0 +1,7 @@
+// compiledir -G=3
+
+// Copyright 2021 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