diff --git a/lexer.py b/lexer.py
index cef2cfd..8f2c767 100644
--- a/lexer.py
+++ b/lexer.py
@@ -79,8 +79,8 @@ t_ignore_COMMENT = r'//.*'
 # A regex rule with some action code
 def t_NUMBER(t):
     r'[+-]*[(0-9).]+\b'
-    t.value = t.value.replace("--", "")
     t.value = t.value.replace("+", "")
+    t.value = t.value.replace("--", "")
     t.value = float(t.value)
     return t