diff --git a/interpreter.py b/interpreter.py
index 6a4c264..0f58deb 100644
--- a/interpreter.py
+++ b/interpreter.py
@@ -36,6 +36,8 @@ def compute_bin(self, left, op, right):
             output = left * right
         elif op.value == "/":
             output = left / right
+        elif op.value == "%":
+            output = left % right
         elif op.value == ">":
             output = 1 if left > right else 0
         elif op.value == ">=":
diff --git a/lexer.py b/lexer.py
index babc99e..36d05b5 100644
--- a/lexer.py
+++ b/lexer.py
@@ -6,7 +6,7 @@ class Lexer:
     # while <expr> do <statement>
     digits = "0123456789"
     letters = "abcdefghijklmnopqrstuvwxyz"
-    operations = "+-/*()="
+    operations = "+-/*%()="
     stopwords = [" "]
     declarations = ["make"]
     boolean = ["and", "or", "not"]
diff --git a/parse.py b/parse.py
index 5fb9f96..3fbf6d6 100644
--- a/parse.py
+++ b/parse.py
@@ -30,7 +30,7 @@ def term(self):
         left_node = self.factor()
         self.move()
         
-        while self.token.value == "*" or self.token.value == "/":
+        while self.token.value == "*" or self.token.value == "/" or self.token.value == "%":
             operator = self.token
             self.move()
             right_node = self.factor()