diff --git a/cc/arm_device.go b/cc/arm_device.go
index 8cd33e3..e736509 100644
--- a/cc/arm_device.go
+++ b/cc/arm_device.go
@@ -283,7 +283,7 @@
 	return t.ldflags
 }
 
-func armToolchainFactory(archVariant string, cpuVariant string) toolchain {
+func armToolchainFactory(archVariant string, cpuVariant string) Toolchain {
 	return &toolchainArm{
 		cflags: strings.Join([]string{
 			"${armCflags}",