diff --git a/src/postfix_evaluator.ts b/src/postfix_evaluator.ts
index 65f06b1..7a26a57 100644
--- a/src/postfix_evaluator.ts
+++ b/src/postfix_evaluator.ts
@@ -94,5 +94,5 @@ export function postfixEval(arr: ReturnType<typeof toPostfix>, Constants: Consta
 		throw new Error('Uncaught Syntax error')
 	}
 	// @ts-ignore
-	return parseFloat(stack[0].value.toFixed(15))
+	return stack[0].value
 }
diff --git a/test/index.js b/test/index.js
index 60211a5..44a986d 100644
--- a/test/index.js
+++ b/test/index.js
@@ -8,10 +8,10 @@ describe('Testing Unit', function () {
 		assert.equal(mexp.eval('2'), 2)
 	})
 	it('checks a math function', function () {
-		assert.equal(mexp.eval('tan(180)'), 0)
+		assert.equal(parseFloat(mexp.eval('tan(180)').toFixed(15)), 0)
 	})
 	it('checks a parenthesis less function', function () {
-		assert.equal(mexp.eval('sin180'), 0)
+		assert.equal(parseFloat(mexp.eval('sin180').toFixed(15)), 0)
 	})
 	it('checks a parenthesis less function with multiplication', function () {
 		assert.equal(mexp.eval('0sin180'), 0)
@@ -160,7 +160,7 @@ describe('Testing Unit', function () {
 		)
 	})
 	it('tan(40+5)', function () {
-		assert.equal(mexp.eval('tan(40+5)'), '1')
+		assert.equal(parseFloat(mexp.eval('tan(40+5)').toFixed(15)), 1)
 	})
 	it('checks when a 0 is missing in a decimal number', function () {
 		assert.equal(mexp.eval('5*.8'), '4')