diff --git a/src/Calculator.ts b/src/Calculator.ts
index 0044d72..04d7a64 100644
--- a/src/Calculator.ts
+++ b/src/Calculator.ts
@@ -73,6 +73,8 @@ export default class Calculator {
   }
 
   public inverse() {
+    this.current = div(1, this.current);
+    this.current = div(1, this.current);
     this.current = div(1, this.current);
     return this;
   }