diff --git a/src/client/postback/namespace.ts b/src/client/postback/namespace.ts
deleted file mode 100644
index c4b3882..0000000
--- a/src/client/postback/namespace.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-declare module 'pagarme' {
-  export namespace client {
-    export namespace postback {
-      function calculateSignature(
-        /** the keys used to sign the hash. */
-        key: string,
-        /** The string to be hashed. */
-        string: string
-      ): string;
-      function verifySignature(
-        /** the keys used to sign the hash. */
-        key: string,
-        /** The string to be hashed. */
-        string: string,
-        /** The expected result. */
-        expected: string
-      ): boolean;
-    }
-  }
-}
diff --git a/src/index.ts b/src/index.ts
index 634cb9d..86d1ad6 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -18,7 +18,7 @@
 /// <reference path="./client/payables/namespace.ts" />
 /// <reference path="./client/paymentLinks/namespace.ts" />
 /// <reference path="./client/plans/namespace.ts" />
-/// <reference path="./client/postback/namespace.ts" />
+/// <reference path="./postback/namespace.ts" />
 /// <reference path="./client/postbacks/namespace.ts" />
 /// <reference path="./client/recipients/namespace.ts" />
 /// <reference path="./client/refunds/namespace.ts" />
diff --git a/src/postback/namespace.ts b/src/postback/namespace.ts
new file mode 100644
index 0000000..5541e45
--- /dev/null
+++ b/src/postback/namespace.ts
@@ -0,0 +1,18 @@
+declare module 'pagarme' {
+  export namespace postback {
+    function calculateSignature(
+      /** the keys used to sign the hash. */
+      key: string,
+      /** The string to be hashed. */
+      string: string
+    ): string;
+    function verifySignature(
+      /** the keys used to sign the hash. */
+      key: string,
+      /** The string to be hashed. */
+      string: string,
+      /** The expected result. */
+      expected: string
+    ): boolean;
+  }
+}