diff --git a/go/gcimporter15/bexport.go b/go/gcimporter15/bexport.go
index f6a55734..53b93106 100644
--- a/go/gcimporter15/bexport.go
+++ b/go/gcimporter15/bexport.go
@@ -119,11 +119,9 @@ func BExportData(pkg *types.Package) []byte {
 	p.int(len(funcs))
 	for _, obj := range funcs {
 		p.string(obj.Name())
-		// The type can only be a signature for functions. However, by always
-		// writing the complete type specification (rather than just a signature)
-		// we keep the option open of sharing common signatures across multiple
-		// functions as a means to further compress the export data.
-		p.typ(obj.Type())
+		sig := obj.Type().(*types.Signature)
+		p.paramList(sig.Params(), sig.Variadic())
+		p.paramList(sig.Results(), false)
 		p.int(-1) // no inlined function bodies
 	}
 
diff --git a/go/gcimporter15/bimport.go b/go/gcimporter15/bimport.go
index 08355a3b..0ec216e9 100644
--- a/go/gcimporter15/bimport.go
+++ b/go/gcimporter15/bimport.go
@@ -91,7 +91,9 @@ func BImportData(imports map[string]*types.Package, data []byte, path string) (i
 	// read funcs
 	for i := p.int(); i > 0; i-- {
 		name := p.string()
-		sig := p.typ(nil).(*types.Signature)
+		params, isddd := p.paramList()
+		result, _ := p.paramList()
+		sig := types.NewSignature(nil, params, result, isddd)
 		p.int() // read and discard index of inlined function body
 		p.declare(types.NewFunc(token.NoPos, pkg, name, sig))
 	}