diff --git a/pkg/moq/moq_test.go b/pkg/moq/moq_test.go
index 6766d4d..fcdc281 100644
--- a/pkg/moq/moq_test.go
+++ b/pkg/moq/moq_test.go
@@ -259,6 +259,28 @@ func TestVendoredPackages(t *testing.T) {
 	}
 }
 
+func TestVendoredBuildConstraints(t *testing.T) {
+	m, err := New("testpackages/buildconstraints/user", "")
+	if err != nil {
+		t.Fatalf("moq.New: %s", err)
+	}
+	var buf bytes.Buffer
+	err = m.Mock(&buf, "Service")
+	if err != nil {
+		t.Errorf("mock error: %s", err)
+	}
+	s := buf.String()
+	// assertions of things that should be mentioned
+	var strs = []string{
+		`"github.com/matryer/buildconstraints"`,
+	}
+	for _, str := range strs {
+		if !strings.Contains(s, str) {
+			t.Errorf("expected but missing: \"%s\"", str)
+		}
+	}
+}
+
 // TestDotImports tests for https://github.com/matryer/moq/issues/21.
 func TestDotImports(t *testing.T) {
 	preDir, err := os.Getwd()
diff --git a/pkg/moq/testpackages/buildconstraints/user/user.go b/pkg/moq/testpackages/buildconstraints/user/user.go
new file mode 100644
index 0000000..10d3d9a
--- /dev/null
+++ b/pkg/moq/testpackages/buildconstraints/user/user.go
@@ -0,0 +1,9 @@
+package user
+
+import "github.com/matryer/buildconstraints"
+
+// Service does something good with computers.
+type Service interface {
+	DoSomething(buildconstraints.SomeType) error
+}
+
diff --git a/pkg/moq/testpackages/buildconstraints/vendor/github.com/matryer/buildconstraints/go17.go b/pkg/moq/testpackages/buildconstraints/vendor/github.com/matryer/buildconstraints/go17.go
new file mode 100644
index 0000000..a03f6f5
--- /dev/null
+++ b/pkg/moq/testpackages/buildconstraints/vendor/github.com/matryer/buildconstraints/go17.go
@@ -0,0 +1,12 @@
+// +build go1.7
+
+package buildconstraints
+
+var someVariable = "Value 1"
+
+// SomeType is just some old type.
+type SomeType struct {
+	// Truth indicates whether true is true or not. Computers.
+	Truth bool
+}
+
diff --git a/pkg/moq/testpackages/buildconstraints/vendor/github.com/matryer/buildconstraints/pre_go17.go b/pkg/moq/testpackages/buildconstraints/vendor/github.com/matryer/buildconstraints/pre_go17.go
new file mode 100644
index 0000000..3fc99b6
--- /dev/null
+++ b/pkg/moq/testpackages/buildconstraints/vendor/github.com/matryer/buildconstraints/pre_go17.go
@@ -0,0 +1,6 @@
+// +build !go1.7
+
+package buildconstraints
+
+var someVariable = "Value 2"
+