diff --git a/src/Contract.php b/src/Contract.php
index 69c5c9b..81a1e81 100644
--- a/src/Contract.php
+++ b/src/Contract.php
@@ -504,7 +504,7 @@ class Contract
                     if ($argsLen !== count($function['inputs'])) {
                         continue;
                     } else {
-                        $paramsLen = $argsLen - 1;
+                        $paramsLen = $argsLen;
                     }
                 }
                 try {
@@ -599,7 +599,7 @@ class Contract
                     if ($argsLen !== count($function['inputs'])) {
                         continue;
                     } else {
-                        $paramsLen = $argsLen - 1;
+                        $paramsLen = $argsLen;
                     }
                 }
                 try {
@@ -718,7 +718,7 @@ class Contract
                         if ($argsLen !== count($function['inputs'])) {
                             continue;
                         } else {
-                            $paramsLen = $argsLen - 1;
+                            $paramsLen = $argsLen;
                         }
                     }
                     try {
diff --git a/test/unit/ContractTest.php b/test/unit/ContractTest.php
index 66e7be7..49db731 100644
--- a/test/unit/ContractTest.php
+++ b/test/unit/ContractTest.php
@@ -631,6 +631,17 @@ class ContractTest extends TestCase
                 $this->assertTrue($result !== null);
             }
         });
+        // test issue 143
+        $contract->at($this->contractAddress)->call('balanceOf', $fromAccount, function ($err, $result) use ($contract) {
+            if ($err !== null) {
+                return $this->fail($err->getMessage());
+            }
+            if (isset($result)) {
+                // $bn = Utils::toBn($result);
+                // $this->assertEquals($bn->toString(), '10000', 'Balance should be 10000.');
+                $this->assertTrue($result !== null);
+            }
+        });
     }
 
     /**