diff --git a/cli/command/image/build/context_test.go b/cli/command/image/build/context_test.go
index 29d48ec1d9..15686e0be4 100644
--- a/cli/command/image/build/context_test.go
+++ b/cli/command/image/build/context_test.go
@@ -18,7 +18,7 @@ import (
 
 const dockerfileContents = "FROM busybox"
 
-func prepareEmpty(t *testing.T) string {
+func prepareEmpty(_ *testing.T) string {
 	return ""
 }