Feature flag for nom dependency
diff --git a/src/helper.rs b/src/helper.rs
index 5299cc4..6c9f6e2 100644
--- a/src/helper.rs
+++ b/src/helper.rs
@@ -1,3 +1,5 @@
+#![cfg(feature = "parsing")]
+
 use nom::{self, IResult};
 
 macro_rules! punct {