diff --git a/Data/SQLite/include/Poco/Data/SQLite/SQLiteStatementImpl.h b/Data/SQLite/include/Poco/Data/SQLite/SQLiteStatementImpl.h
index eb2a6ccdc..ac521e403 100644
--- a/Data/SQLite/include/Poco/Data/SQLite/SQLiteStatementImpl.h
+++ b/Data/SQLite/include/Poco/Data/SQLite/SQLiteStatementImpl.h
@@ -28,8 +28,11 @@
 #include "Poco/SharedPtr.h"
 
 
-struct sqlite3;
-struct sqlite3_stmt;
+extern "C"
+{
+	typedef struct sqlite3 sqlite3;
+	typedef struct sqlite3_stmt sqlite3_stmt;
+}
 
 
 namespace Poco {
diff --git a/Data/SQLite/include/Poco/Data/SQLite/SessionImpl.h b/Data/SQLite/include/Poco/Data/SQLite/SessionImpl.h
index 769d51f3e..a843b9347 100644
--- a/Data/SQLite/include/Poco/Data/SQLite/SessionImpl.h
+++ b/Data/SQLite/include/Poco/Data/SQLite/SessionImpl.h
@@ -25,16 +25,16 @@
 #include "Poco/Data/SQLite/Binder.h"
 #include "Poco/Data/AbstractSessionImpl.h"
 #include "Poco/SharedPtr.h"
+#include "Poco/Mutex.h"
 
 
-struct sqlite3;
-struct sqlite3_stmt;
+extern "C"
+{
+	typedef struct sqlite3 sqlite3;
+}
 
 
 namespace Poco {
-
-class Mutex;
-
 namespace Data {
 namespace SQLite {
 
@@ -127,7 +127,8 @@ private:
 	bool        _connected;
 	bool        _isTransaction;
 	int         _timeout;
-	Mutex       _mutex;
+	Poco::Mutex _mutex;
+
 	static const std::string DEFERRED_BEGIN_TRANSACTION;
 	static const std::string COMMIT_TRANSACTION;
 	static const std::string ABORT_TRANSACTION;
diff --git a/Data/SQLite/include/Poco/Data/SQLite/Utility.h b/Data/SQLite/include/Poco/Data/SQLite/Utility.h
index 305bae873..2ce1c1a95 100644
--- a/Data/SQLite/include/Poco/Data/SQLite/Utility.h
+++ b/Data/SQLite/include/Poco/Data/SQLite/Utility.h
@@ -28,8 +28,11 @@
 #include <map>
 
 
-struct sqlite3;
-struct sqlite3_stmt;
+extern "C"
+{
+	typedef struct sqlite3 sqlite3;
+	typedef struct sqlite3_stmt sqlite3_stmt;
+}
 
 
 namespace Poco {
@@ -200,13 +203,6 @@ private:
 //
 // inlines
 //
-
-inline sqlite3* Utility::dbHandle(const Session& session)
-{
-	return reinterpret_cast<sqlite3*>(AnyCast<void*>(session.getProperty("handle")));
-}
-
-
 inline std::string Utility::lastError(const Session& session)
 {
 	poco_assert_dbg ((0 == icompare(session.connector(), 0, 6, "sqlite")));
diff --git a/Data/SQLite/src/SessionImpl.cpp b/Data/SQLite/src/SessionImpl.cpp
index 2440a8749..daa2da172 100644
--- a/Data/SQLite/src/SessionImpl.cpp
+++ b/Data/SQLite/src/SessionImpl.cpp
@@ -24,7 +24,11 @@
 #include "Poco/String.h"
 #include "Poco/Mutex.h"
 #include "Poco/Data/DataException.h"
+#if defined(POCO_UNBUNDLED)
+#include <sqlite3.h>
+#else
 #include "sqlite3.h"
+#endif
 #include <cstdlib>
 
 
@@ -52,7 +56,7 @@ SessionImpl::SessionImpl(const std::string& fileName, std::size_t loginTimeout):
 {
 	open();
 	setConnectionTimeout(CONNECTION_TIMEOUT_DEFAULT);
-	setProperty("handle", static_cast<void*>(_pDB));
+	setProperty("handle", _pDB);
 	addFeature("autoCommit", 
 		&SessionImpl::autoCommit, 
 		&SessionImpl::isAutoCommit);
@@ -255,4 +259,14 @@ bool SessionImpl::isAutoCommit(const std::string&)
 }
 
 
+// NOTE: Utility::dbHandle() has been moved here from Utility.cpp
+// as a workaround for a failing AnyCast with Clang.
+// See <https://github.com/pocoproject/poco/issues/578>
+// for a discussion.
+sqlite3* Utility::dbHandle(const Session& session)
+{
+	return AnyCast<sqlite3*>(session.getProperty("handle"));
+}
+
+
 } } } // namespace Poco::Data::SQLite
diff --git a/Data/SQLite/src/Utility.cpp b/Data/SQLite/src/Utility.cpp
index cf4593489..8bf46ee85 100644
--- a/Data/SQLite/src/Utility.cpp
+++ b/Data/SQLite/src/Utility.cpp
@@ -63,8 +63,6 @@ Poco::Mutex Utility::_mutex;
 
 Utility::Utility()
 {
-	Poco::Mutex::ScopedLock l(_mutex);
-
 	if (_types.empty())
 	{
 		_types.insert(TypeMap::value_type("", MetaColumn::FDT_STRING));
@@ -135,7 +133,11 @@ MetaColumn::ColumnDataType Utility::getColumnType(sqlite3_stmt* pStmt, std::size
 {
 	poco_assert_dbg (pStmt);
 
-	static Utility u;
+	// Ensure statics are initialized
+	{
+		Poco::Mutex::ScopedLock lock(_mutex);
+		static Utility u;
+	}
 	
 	const char* pc = sqlite3_column_decltype(pStmt, (int) pos);
 	std::string sqliteType = pc ? pc : "";
@@ -314,4 +316,10 @@ void* Utility::eventHookRegister(sqlite3* pDB, RollbackCallbackType callbackFn,
 }
 
 
+// NOTE: Utility::dbHandle() has been moved to SessionImpl.cpp,
+// as a workaround for a failing AnyCast with Clang.
+// See <https://github.com/pocoproject/poco/issues/578>
+// for a discussion.
+
+
 } } } // namespace Poco::Data::SQLite