diff --git a/go/ssa/interp/reflect.go b/go/ssa/interp/reflect.go
index e7f89d7db65..76926578d05 100644
--- a/go/ssa/interp/reflect.go
+++ b/go/ssa/interp/reflect.go
@@ -28,7 +28,7 @@ type opaqueType struct {
 func (t *opaqueType) String() string { return t.name }
 
 // A bogus "reflect" type-checker package.  Shared across interpreters.
-var reflectTypesPackage = types.NewPackage("reflect", "reflect", nil)
+var reflectTypesPackage = types.NewPackage("reflect", "reflect")
 
 // rtype is the concrete type the interpreter uses to implement the
 // reflect.Type interface.  Since its type is opaque to the target
diff --git a/go/ssa/testmain.go b/go/ssa/testmain.go
index 09293331bce..51c8d4ed95c 100644
--- a/go/ssa/testmain.go
+++ b/go/ssa/testmain.go
@@ -32,7 +32,7 @@ func (prog *Program) CreateTestMainPackage(pkgs ...*Package) *Package {
 		Prog:    prog,
 		Members: make(map[string]Member),
 		values:  make(map[types.Object]Value),
-		Object:  types.NewPackage("testmain", "testmain", nil),
+		Object:  types.NewPackage("testmain", "testmain"),
 	}
 
 	// Build package's init function.