diff --git a/kernel-builder/src/card.rs b/kernel-builder/src/card.rs
index 1b99a475..fc7cfb0d 100644
--- a/kernel-builder/src/card.rs
+++ b/kernel-builder/src/card.rs
@@ -86,7 +86,7 @@ fn render_card(build: &Build, kernel_dir: &Path) -> Result<String> {
             functions => functions,
             has_benchmark => has_benchmark,
             upstream => build.general.upstream.as_ref().map(|u| u.to_string()),
-            license => build.general.license.clone(),
+            license => build.general.license.as_ref().map(|l| l.to_lowercase()),
         })
         .wrap_err("Cannot render card template")
 }