diff --git a/crates/biome_grit_parser/src/lexer/mod.rs b/crates/biome_grit_parser/src/lexer/mod.rs
index 9e26c86d71ab..c14f86b4d68f 100644
--- a/crates/biome_grit_parser/src/lexer/mod.rs
+++ b/crates/biome_grit_parser/src/lexer/mod.rs
@@ -180,7 +180,7 @@ impl<'src> GritLexer<'src> {
     fn lex_token(&mut self, current: u8) -> GritSyntaxKind {
         match current {
             b'\n' | b'\r' => {
-                debug_assert!(self.consume_newline());
+                self.consume_newline();
                 NEWLINE
             }
             b'\t' | b' ' => self.consume_whitespaces(),
diff --git a/crates/biome_grit_parser/src/parser/mod.rs b/crates/biome_grit_parser/src/parser/mod.rs
index 49ceb97cdc29..9f8000ecbbc0 100644
--- a/crates/biome_grit_parser/src/parser/mod.rs
+++ b/crates/biome_grit_parser/src/parser/mod.rs
@@ -3,6 +3,7 @@ mod literals;
 mod parse_error;
 mod patterns;
 mod predicates;
+mod tests;
 
 use crate::constants::*;
 use crate::token_source::GritTokenSource;
diff --git a/crates/biome_grit_parser/src/parser/tests.rs b/crates/biome_grit_parser/src/parser/tests.rs
new file mode 100644
index 000000000000..5d795edc2c5f
--- /dev/null
+++ b/crates/biome_grit_parser/src/parser/tests.rs
@@ -0,0 +1,11 @@
+#![cfg(test)]
+
+use crate::parse_grit;
+
+/// This pattern should be parseable, but previously caused explosive memory usage
+#[test]
+fn parse_language_declaration() {
+    let code = "language js\n";
+    let parse = parse_grit(code);
+    assert!(parse.diagnostics().is_empty());
+}