diff --git a/src/lib.rs b/src/lib.rs
index c1d06e5..d522116 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -46,6 +46,7 @@ pub fn parse(data: &str) -> Result<Program, String> {
     let mut argument_builder: String = "".to_string();
     let mut statements: Vec<Statement> = vec![];
     let mut labels: HashMap<String, usize> = HashMap::new();
+    let mut potential_argument_length;
 
     let mut inside_string = false;
     let mut string_escape = false;
@@ -55,7 +56,7 @@ pub fn parse(data: &str) -> Result<Program, String> {
             program_begun = true;
         } else if program_begun {
             if operator.is_none() {
-                let (operator, potential_argument_length) = operator_to_arglength(char.clone());
+                (operator, potential_argument_length) = operator_to_arglength(char.clone());
                 if potential_argument_length.is_none() { return Err(format!("Invalid operator {} at statement {}.", char, statements.len())); }
                 expected_arguments = potential_argument_length.unwrap();
             } else if expected_arguments > 0 {