diff --git a/src/Contracts/Types/Address.php b/src/Contracts/Types/Address.php
index 38a7ce6..483edc1 100644
--- a/src/Contracts/Types/Address.php
+++ b/src/Contracts/Types/Address.php
@@ -34,7 +34,7 @@ class Address extends SolidityType implements IType
      */
     public function isType($name)
     {
-        return (preg_match('/address(\[([0-9]+)\])*/', $name) === 1);
+        return (preg_match('/address(\[([0-9]*)\])*/', $name) === 1);
     }
 
     /**
diff --git a/src/Contracts/Types/Boolean.php b/src/Contracts/Types/Boolean.php
index efd3118..9aeb833 100644
--- a/src/Contracts/Types/Boolean.php
+++ b/src/Contracts/Types/Boolean.php
@@ -34,7 +34,7 @@ class Boolean extends SolidityType implements IType
      */
     public function isType($name)
     {
-        return (preg_match('/bool(\[([0-9]+)\])*/', $name) === 1);
+        return (preg_match('/bool(\[([0-9]*)\])*/', $name) === 1);
     }
 
     /**
diff --git a/src/Contracts/Types/Bytes.php b/src/Contracts/Types/Bytes.php
index 7aaa40a..a5aded7 100644
--- a/src/Contracts/Types/Bytes.php
+++ b/src/Contracts/Types/Bytes.php
@@ -34,7 +34,7 @@ class Bytes extends SolidityType implements IType
      */
     public function isType($name)
     {
-        return (preg_match('/bytes([0-9]{1,})?(\[([0-9]+)\])*/', $name) === 1);
+        return (preg_match('/bytes([0-9]{1,})?(\[([0-9]*)\])*/', $name) === 1);
     }
 
     /**
diff --git a/src/Contracts/Types/DynamicBytes.php b/src/Contracts/Types/DynamicBytes.php
index dcf1d32..360070e 100644
--- a/src/Contracts/Types/DynamicBytes.php
+++ b/src/Contracts/Types/DynamicBytes.php
@@ -34,7 +34,7 @@ class DynamicBytes extends SolidityType implements IType
      */
     public function isType($name)
     {
-        return (preg_match('/bytes(\[([0-9]+)\])*/', $name) === 1);
+        return (preg_match('/bytes(\[([0-9]*)\])*/', $name) === 1);
     }
 
     /**
diff --git a/src/Contracts/Types/Integer.php b/src/Contracts/Types/Integer.php
index 55611d6..385c9ca 100644
--- a/src/Contracts/Types/Integer.php
+++ b/src/Contracts/Types/Integer.php
@@ -34,7 +34,7 @@ class Integer extends SolidityType implements IType
      */
     public function isType($name)
     {
-        return (preg_match('/int([0-9]{1,})?(\[([0-9]+)\])*/', $name) === 1);
+        return (preg_match('/int([0-9]{1,})?(\[([0-9]*)\])*/', $name) === 1);
     }
 
     /**
diff --git a/src/Contracts/Types/Str.php b/src/Contracts/Types/Str.php
index 9ffc06d..dbd7661 100644
--- a/src/Contracts/Types/Str.php
+++ b/src/Contracts/Types/Str.php
@@ -34,7 +34,7 @@ class Str extends SolidityType implements IType
      */
     public function isType($name)
     {
-        return (preg_match('/string(\[([0-9]+)\])*/', $name) === 1);
+        return (preg_match('/string(\[([0-9]*)\])*/', $name) === 1);
     }
 
     /**
diff --git a/src/Contracts/Types/Uinteger.php b/src/Contracts/Types/Uinteger.php
index 560c349..7a4a82e 100644
--- a/src/Contracts/Types/Uinteger.php
+++ b/src/Contracts/Types/Uinteger.php
@@ -34,7 +34,7 @@ class Uinteger extends SolidityType implements IType
      */
     public function isType($name)
     {
-        return (preg_match('/uint([0-9]{1,})?(\[([0-9]+)\])*/', $name) === 1);
+        return (preg_match('/uint([0-9]{1,})?(\[([0-9]*)\])*/', $name) === 1);
     }
 
     /**