diff --git a/Makefile b/Makefile
index 420f306..39d52e3 100644
--- a/Makefile
+++ b/Makefile
@@ -20,9 +20,11 @@ generate: root build
 	.root/bin/easyjson -stubs \
 		.root/src/$(PKG)/tests/snake.go \
 		.root/src/$(PKG)/tests/data.go \
-		.root/src/$(PKG)/tests/omitempty.go
+		.root/src/$(PKG)/tests/omitempty.go \
+		.root/src/$(PKG)/tests/nothing.go
 
 	.root/bin/easyjson -all .root/src/$(PKG)/tests/data.go 
+	.root/bin/easyjson -all .root/src/$(PKG)/tests/nothing.go
 	.root/bin/easyjson -snake_case .root/src/$(PKG)/tests/snake.go
 	.root/bin/easyjson -omit_empty .root/src/$(PKG)/tests/omitempty.go 
 	.root/bin/easyjson -build_tags=use_easyjson .root/src/$(PKG)/benchmark/data.go
diff --git a/bootstrap/bootstrap.go b/bootstrap/bootstrap.go
index 3a83e94..04aaaad 100644
--- a/bootstrap/bootstrap.go
+++ b/bootstrap/bootstrap.go
@@ -50,11 +50,14 @@ func (g *Generator) writeStub() error {
 	fmt.Fprintln(f, "// compilable during generation.")
 	fmt.Fprintln(f)
 	fmt.Fprintln(f, "package ", g.PkgName)
-	fmt.Fprintln(f)
-	fmt.Fprintln(f, "import (")
-	fmt.Fprintln(f, `  "`+pkgWriter+`"`)
-	fmt.Fprintln(f, `  "`+pkgLexer+`"`)
-	fmt.Fprintln(f, ")")
+
+	if len(g.Types) > 0 {
+		fmt.Fprintln(f)
+		fmt.Fprintln(f, "import (")
+		fmt.Fprintln(f, `  "`+pkgWriter+`"`)
+		fmt.Fprintln(f, `  "`+pkgLexer+`"`)
+		fmt.Fprintln(f, ")")
+	}
 
 	for _, t := range g.Types {
 		fmt.Fprintln(f)
@@ -90,8 +93,10 @@ func (g *Generator) writeMain() (path string, err error) {
 	fmt.Fprintln(f, `  "os"`)
 	fmt.Fprintln(f)
 	fmt.Fprintf(f, "  %q\n", genPackage)
-	fmt.Fprintln(f)
-	fmt.Fprintf(f, "  pkg %q\n", g.PkgPath)
+	if len(g.Types) > 0 {
+		fmt.Fprintln(f)
+		fmt.Fprintf(f, "  pkg %q\n", g.PkgPath)
+	}
 	fmt.Fprintln(f, ")")
 	fmt.Fprintln(f)
 	fmt.Fprintln(f, "func main() {")
diff --git a/gen/generator.go b/gen/generator.go
index 3128594..83bf812 100644
--- a/gen/generator.go
+++ b/gen/generator.go
@@ -156,7 +156,12 @@ func (g *Generator) printHeader() {
 
 	fmt.Println(")")
 	fmt.Println("")
-	fmt.Println("var _ = json.RawMessage{} // suppress unused package warning")
+	fmt.Println("// suppress unused package warning")
+	fmt.Println("var (")
+	fmt.Println("   _ = json.RawMessage{}")
+	fmt.Println("   _ = jlexer.Lexer{}")
+	fmt.Println("   _ = jwriter.Writer{}")
+	fmt.Println(")")
 
 	fmt.Println()
 }
diff --git a/tests/nothing.go b/tests/nothing.go
new file mode 100644
index 0000000..35334f5
--- /dev/null
+++ b/tests/nothing.go
@@ -0,0 +1,3 @@
+package tests
+
+// No structs in this file