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diff --git a/src/base/cvc4_check.cpp b/src/base/cvc4_check.cpp
new file mode 100644
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+++ b/src/base/cvc4_check.cpp
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+/*********************                                                        */
+/*! \file cvc4_check.cpp
+ ** \verbatim
+ ** Top contributors (to current version):
+ **   Tim King
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2018 by the authors listed in the file AUTHORS
+ ** in the top-level source directory) and their institutional affiliations.
+ ** All rights reserved.  See the file COPYING in the top-level source
+ ** directory for licensing information.\endverbatim
+ **
+ ** \brief Assertion utility classes, functions and macros.
+ **
+ ** Implementation of assertion utility classes, functions and macros.
+ **/
+
+#include "base/cvc4_check.h"
+
+#include <cstdlib>
+#include <iostream>
+
+namespace CVC4 {
+
+FatalStream::FatalStream(const char* function, const char* file, int line)
+{
+  stream() << "Fatal failure within " << function << " at " << file << ":"
+           << line << "\n";
+}
+
+FatalStream::~FatalStream()
+{
+  Flush();
+  abort();
+}
+
+std::ostream& FatalStream::stream() { return std::cerr; }
+
+void FatalStream::Flush()
+{
+  stream() << std::endl;
+  stream().flush();
+}
+
+}  // namespace CVC4