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diff --git a/src/options/strings_process_loop_mode.h b/src/options/strings_process_loop_mode.h
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+/*********************                                                        */
+/*! \file strings_process_loop_mode.h
+ ** \verbatim
+ ** Top contributors (to current version):
+ **   Andres Noetzli
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2019 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 Modes for processing looping word equations in the string solver.
+ **
+ ** Modes for processing looping word equations in the string solver.
+ **/
+
+#include "cvc4_private.h"
+
+#ifndef __CVC4__THEORY__STRINGS__PROCESS_LOOP_MODE_H
+#define __CVC4__THEORY__STRINGS__PROCESS_LOOP_MODE_H
+
+#include <iosfwd>
+
+namespace CVC4 {
+namespace theory {
+namespace strings {
+
+/** Enumeration of bit-blasting modes */
+enum class ProcessLoopMode
+{
+  /** Perform full loop processing. */
+  FULL,
+
+  /** Omit normal loop breaking. */
+  SIMPLE,
+
+  /** Abort if normal loop breaking is required. */
+  SIMPLE_ABORT,
+
+  /** Omit loop processing. */
+  NONE,
+
+  /** Abort if looping word equations are encountered. */
+  ABORT
+}; // enum ProcessLoopMode
+
+}  // namespace strings
+}  // namespace theory
+
+std::ostream& operator<<(std::ostream& out,
+                         theory::strings::ProcessLoopMode mode);
+
+}  // namespace CVC4
+
+#endif /* __CVC4__THEORY__BV__BITBLAST_MODE_H */