diff --git a/dbms/include/DB/Core/Exception.h b/dbms/include/DB/Core/Exception.h
index 2acec282160..ccc87461335 100644
--- a/dbms/include/DB/Core/Exception.h
+++ b/dbms/include/DB/Core/Exception.h
@@ -38,4 +38,7 @@ using Poco::SharedPtr;
 typedef SharedPtr<Poco::Exception> ExceptionPtr;
 typedef std::vector<ExceptionPtr> Exceptions;
 
+
+void throwFromErrno(const std::string & s, int code = 0);
+
 }
diff --git a/dbms/include/DB/IO/ReadBufferFromFileDescriptor.h b/dbms/include/DB/IO/ReadBufferFromFileDescriptor.h
index 9b290f2b0e7..632a3eb9750 100644
--- a/dbms/include/DB/IO/ReadBufferFromFileDescriptor.h
+++ b/dbms/include/DB/IO/ReadBufferFromFileDescriptor.h
@@ -46,12 +46,6 @@ protected:
 		return true;
 	}
 
-	void throwFromErrno(const std::string & s, int code)
-	{
-		char buf[128];
-		throw Exception(s + ", errno: " + Poco::NumberFormatter::format(errno) + ", strerror: " + std::string(strerror_r(errno, buf, sizeof(buf))), code);
-	}
-
 	/// Имя или описание файла
 	virtual std::string getFileName()
 	{
diff --git a/dbms/include/DB/IO/WriteBufferFromFileDescriptor.h b/dbms/include/DB/IO/WriteBufferFromFileDescriptor.h
index e150e254a25..8bead1cbebf 100644
--- a/dbms/include/DB/IO/WriteBufferFromFileDescriptor.h
+++ b/dbms/include/DB/IO/WriteBufferFromFileDescriptor.h
@@ -40,12 +40,6 @@ protected:
 		}
 	}
 
-	void throwFromErrno(const std::string & s, int code)
-	{
-		char buf[128];
-		throw Exception(s + ", errno: " + Poco::NumberFormatter::format(errno) + ", strerror: " + std::string(strerror_r(errno, buf, sizeof(buf))), code);
-	}
-
 	/// Имя или описание файла
 	virtual std::string getFileName()
 	{
diff --git a/dbms/src/Client/Client.cpp b/dbms/src/Client/Client.cpp
index 17660a0c7a3..3540203bf63 100644
--- a/dbms/src/Client/Client.cpp
+++ b/dbms/src/Client/Client.cpp
@@ -57,13 +57,6 @@ namespace DB
 using Poco::SharedPtr;
 
 
-void throwFromErrno(const std::string & s, int code)
-{
-	char buf[128];
-	throw Exception(s + ", errno: " + Poco::NumberFormatter::format(errno) + ", strerror: " + std::string(strerror_r(errno, buf, sizeof(buf))), code);
-}
-
-
 /** Пока существует объект этого класса - блокирует сигнал INT, при этом позволяет узнать, не пришёл ли он.
   * В один момент времени используйте только один экземпляр этого класса.
   */
diff --git a/dbms/src/Core/Exception.cpp b/dbms/src/Core/Exception.cpp
index e42a1c3984e..af72fdbe27b 100644
--- a/dbms/src/Core/Exception.cpp
+++ b/dbms/src/Core/Exception.cpp
@@ -1,3 +1,8 @@
+#include <errno.h>
+#include <string.h>
+
+#include <Poco/NumberFormatter.h>
+
 #include <DB/Core/Exception.h>
 
 
@@ -39,4 +44,11 @@ void Exception::rethrow() const
 	throw *this;
 }
 
+
+void throwFromErrno(const std::string & s, int code)
+{
+	char buf[128];
+	throw Exception(s + ", errno: " + Poco::NumberFormatter::format(errno) + ", strerror: " + std::string(strerror_r(errno, buf, sizeof(buf))), code);
+}
+
 }
diff --git a/utils/iotest/main.cpp b/utils/iotest/main.cpp
index a57ada24019..8eeff43572e 100644
--- a/utils/iotest/main.cpp
+++ b/utils/iotest/main.cpp
@@ -12,10 +12,15 @@
 #include <Poco/Exception.h>
 #include <Poco/SharedPtr.h>
 
+#include <DB/Core/Exception.h>
+
 #include <statdaemons/threadpool.hpp>
 #include <statdaemons/Stopwatch.h>
 
 
+using DB::throwFromErrno;
+
+
 enum Mode
 {
 	MODE_READ,
@@ -26,14 +31,6 @@ enum Mode
 typedef Poco::SharedPtr<Poco::Exception> ExceptionPtr;
 
 
-void throwFromErrno(const std::string & s)
-{
-	char buf[128];
-	throw Poco::Exception(s + ", errno: " + Poco::NumberFormatter::format(errno)
-		+ ", strerror: " + std::string(strerror_r(errno, buf, sizeof(buf))));
-}
-
-
 void thread(int fd, Mode mode, size_t min_offset, size_t max_offset, size_t block_size, size_t count, ExceptionPtr & exception)
 {
 	try