diff --git a/src/parser/lesser_block.rs b/src/parser/lesser_block.rs
index f899c91..507a851 100644
--- a/src/parser/lesser_block.rs
+++ b/src/parser/lesser_block.rs
@@ -261,11 +261,10 @@ fn data<'s>(input: OrgSource<'s>) -> Res<OrgSource<'s>, OrgSource<'s>> {
     is_not("\r\n")(input)
 }
 
-fn lesser_block_end(current_name: &str) -> impl ContextMatcher {
-    let current_name_lower = current_name.to_lowercase();
-    move |context, input: OrgSource<'_>| {
-        _lesser_block_end(context, input, current_name_lower.as_str())
-    }
+fn lesser_block_end<'c>(current_name: &'c str) -> impl ContextMatcher + 'c {
+    // Since the lesser block names are statically defined in code, we can simply assert that the name is lowercase instead of causing an allocation by converting to lowercase.
+    debug_assert!(current_name == current_name.to_lowercase());
+    move |context, input: OrgSource<'_>| _lesser_block_end(context, input, current_name)
 }
 
 #[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]