diff --git a/td/mtproto/Handshake.cpp b/td/mtproto/Handshake.cpp
index 49e766e5f..62e4679c6 100644
--- a/td/mtproto/Handshake.cpp
+++ b/td/mtproto/Handshake.cpp
@@ -10,6 +10,7 @@
 
 #include "td/mtproto/mtproto_api.h"
 
+#include "td/utils/as.h"
 #include "td/utils/buffer.h"
 #include "td/utils/crypto.h"
 #include "td/utils/format.h"
diff --git a/td/mtproto/SessionConnection.cpp b/td/mtproto/SessionConnection.cpp
index 4845eb47b..a4dce7403 100644
--- a/td/mtproto/SessionConnection.cpp
+++ b/td/mtproto/SessionConnection.cpp
@@ -16,6 +16,7 @@
 #include "td/mtproto/TcpTransport.h"
 #include "td/mtproto/Transport.h"
 
+#include "td/utils/as.h"
 #include "td/utils/format.h"
 #include "td/utils/Gzip.h"
 #include "td/utils/logging.h"
diff --git a/td/mtproto/TcpTransport.cpp b/td/mtproto/TcpTransport.cpp
index 81a29e743..bf09ea6e9 100644
--- a/td/mtproto/TcpTransport.cpp
+++ b/td/mtproto/TcpTransport.cpp
@@ -6,6 +6,7 @@
 //
 #include "td/mtproto/TcpTransport.h"
 
+#include "td/utils/as.h"
 #include "td/utils/logging.h"
 #include "td/utils/Random.h"
 #include "td/utils/Slice.h"
diff --git a/td/mtproto/Transport.cpp b/td/mtproto/Transport.cpp
index 4af65de10..589151426 100644
--- a/td/mtproto/Transport.cpp
+++ b/td/mtproto/Transport.cpp
@@ -9,6 +9,7 @@
 #include "td/mtproto/AuthKey.h"
 #include "td/mtproto/crypto.h"
 
+#include "td/utils/as.h"
 #include "td/utils/crypto.h"
 #include "td/utils/format.h"
 #include "td/utils/logging.h"
diff --git a/td/mtproto/crypto.cpp b/td/mtproto/crypto.cpp
index 056712214..1aa34a2d4 100644
--- a/td/mtproto/crypto.cpp
+++ b/td/mtproto/crypto.cpp
@@ -8,6 +8,7 @@
 
 #include "td/mtproto/mtproto_api.h"
 
+#include "td/utils/as.h"
 #include "td/utils/crypto.h"
 #include "td/utils/int_types.h"  // for UInt256, UInt128, etc
 #include "td/utils/logging.h"
diff --git a/td/telegram/SecretChatActor.cpp b/td/telegram/SecretChatActor.cpp
index ce4784026..e971f38f9 100644
--- a/td/telegram/SecretChatActor.cpp
+++ b/td/telegram/SecretChatActor.cpp
@@ -19,6 +19,7 @@
 
 #include "td/actor/MultiPromise.h"
 
+#include "td/utils/as.h"
 #include "td/utils/crypto.h"
 #include "td/utils/format.h"
 #include "td/utils/logging.h"
diff --git a/td/telegram/SecureStorage.cpp b/td/telegram/SecureStorage.cpp
index f0b441693..cc9621565 100644
--- a/td/telegram/SecureStorage.cpp
+++ b/td/telegram/SecureStorage.cpp
@@ -6,6 +6,7 @@
 //
 #include "td/telegram/SecureStorage.h"
 
+#include "td/utils/as.h"
 #include "td/utils/format.h"
 #include "td/utils/logging.h"
 #include "td/utils/misc.h"
diff --git a/td/telegram/files/FileDownloader.cpp b/td/telegram/files/FileDownloader.cpp
index ff64de7ee..99ad9f744 100644
--- a/td/telegram/files/FileDownloader.cpp
+++ b/td/telegram/files/FileDownloader.cpp
@@ -13,6 +13,7 @@
 #include "td/telegram/net/DcId.h"
 #include "td/telegram/UniqueId.h"
 
+#include "td/utils/as.h"
 #include "td/utils/buffer.h"
 #include "td/utils/common.h"
 #include "td/utils/crypto.h"
diff --git a/td/telegram/files/FileLocation.h b/td/telegram/files/FileLocation.h
index c4d56f594..cb457741f 100644
--- a/td/telegram/files/FileLocation.h
+++ b/td/telegram/files/FileLocation.h
@@ -13,6 +13,7 @@
 #include "td/telegram/net/DcId.h"
 #include "td/telegram/SecureStorage.h"
 
+#include "td/utils/as.h"
 #include "td/utils/buffer.h"
 #include "td/utils/common.h"
 #include "td/utils/crypto.h"
diff --git a/td/telegram/net/NetQuery.cpp b/td/telegram/net/NetQuery.cpp
index d555e6121..195044376 100644
--- a/td/telegram/net/NetQuery.cpp
+++ b/td/telegram/net/NetQuery.cpp
@@ -8,6 +8,7 @@
 
 #include "td/telegram/Global.h"
 
+#include "td/utils/as.h"
 #include "td/utils/misc.h"
 #include "td/utils/Slice.h"
 
diff --git a/tdutils/CMakeLists.txt b/tdutils/CMakeLists.txt
index d477647d1..a933cd101 100644
--- a/tdutils/CMakeLists.txt
+++ b/tdutils/CMakeLists.txt
@@ -133,6 +133,7 @@ set(TDUTILS_SOURCE
   td/utils/port/detail/WineventPoll.h
 
   td/utils/AesCtrByteFlow.h
+  td/utils/as.h
   td/utils/base64.h
   td/utils/benchmark.h
   td/utils/BigNum.h
diff --git a/tdutils/td/utils/as.h b/tdutils/td/utils/as.h
new file mode 100644
index 000000000..cf8f17cb4
--- /dev/null
+++ b/tdutils/td/utils/as.h
@@ -0,0 +1,64 @@
+//
+// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+#pragma once
+
+#include <cstring>
+
+namespace td {
+
+template <class T>
+class As {
+ public:
+  As(void *ptr) : ptr_(ptr) {
+  }
+  As(As &&) = default;
+  As<T> &operator=(const As &new_value) && {
+    memcpy(ptr_, new_value.ptr_, sizeof(T));
+    return *this;
+  }
+  As<T> &operator=(const T new_value) && {
+    memcpy(ptr_, &new_value, sizeof(T));
+    return *this;
+  }
+
+  operator T() const {
+    T res;
+    memcpy(&res, ptr_, sizeof(T));
+    return res;
+  }
+
+ private:
+  void *ptr_;
+};
+
+template <class T>
+class ConstAs {
+ public:
+  ConstAs(const void *ptr) : ptr_(ptr) {
+  }
+
+  operator T() const {
+    T res;
+    memcpy(&res, ptr_, sizeof(T));
+    return res;
+  }
+
+ private:
+  const void *ptr_;
+};
+
+template <class ToT, class FromT>
+As<ToT> as(FromT *from) {
+  return As<ToT>(from);
+}
+
+template <class ToT, class FromT>
+const ConstAs<ToT> as(const FromT *from) {
+  return ConstAs<ToT>(from);
+}
+
+}  // namespace td
diff --git a/tdutils/td/utils/common.h b/tdutils/td/utils/common.h
index a9f7630c1..ba520d94a 100644
--- a/tdutils/td/utils/common.h
+++ b/tdutils/td/utils/common.h
@@ -45,7 +45,6 @@
 #include "td/utils/int_types.h"
 #include "td/utils/unique_ptr.h"
 
-#include <cstring>  // temporary for std::memcpy
 #include <string>
 #include <vector>
 
@@ -108,55 +107,4 @@ struct Auto {
   }
 };
 
-template <class T>
-class As {
- public:
-  As(void *ptr) : ptr_(ptr) {
-  }
-  As(As &&) = default;
-  As<T> &operator=(const As &new_value) && {
-    memcpy(ptr_, new_value.ptr_, sizeof(T));
-    return *this;
-  }
-  As<T> &operator=(const T new_value) && {
-    memcpy(ptr_, &new_value, sizeof(T));
-    return *this;
-  }
-
-  operator T() const {
-    T res;
-    memcpy(&res, ptr_, sizeof(T));
-    return res;
-  }
-
- private:
-  void *ptr_;
-};
-
-template <class T>
-class ConstAs {
- public:
-  ConstAs(const void *ptr) : ptr_(ptr) {
-  }
-
-  operator T() const {
-    T res;
-    memcpy(&res, ptr_, sizeof(T));
-    return res;
-  }
-
- private:
-  const void *ptr_;
-};
-
-template <class ToT, class FromT>
-As<ToT> as(FromT *from) {
-  return As<ToT>(from);
-}
-
-template <class ToT, class FromT>
-const ConstAs<ToT> as(const FromT *from) {
-  return ConstAs<ToT>(from);
-}
-
 }  // namespace td
diff --git a/tdutils/test/misc.cpp b/tdutils/test/misc.cpp
index 66b06649d..5f092074f 100644
--- a/tdutils/test/misc.cpp
+++ b/tdutils/test/misc.cpp
@@ -4,6 +4,7 @@
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 //
+#include "td/utils/as.h"
 #include "td/utils/base64.h"
 #include "td/utils/BigNum.h"
 #include "td/utils/bits.h"