diff --git a/cli.js b/cli.js
index 0428de1..951e74d 100755
--- a/cli.js
+++ b/cli.js
@@ -169,11 +169,11 @@ generate call parameters
     snarkjs generatecall <options>
 
     Outputs into the console the raw parameters to be used in 'verifyProof'
-    method of the solidity verifier.
+    method of the solidity verifier function.
 
     -p or --proof
 
-        Input filenam with the zero knowlage proof you want to use
+        Input filename with the zero knowlage proof you want to use
 
         Default: proof.json
 
diff --git a/src/bn128.js b/src/bn128.js
index eb1df3e..105ec81 100644
--- a/src/bn128.js
+++ b/src/bn128.js
@@ -66,7 +66,7 @@ class BN128 {
 
         // Set loopCountNeg
         if (this.loopCount.isNegative()) {
-            this.loopCount = this.neg();
+            this.loopCount = this.loopCount.neg();
             this.loopCountNeg = true;
         } else {
             this.loopCountNeg = false;