diff --git a/src/library/blast/CMakeLists.txt b/src/library/blast/CMakeLists.txt
index e4749b7f1f..6e0e49beb9 100644
--- a/src/library/blast/CMakeLists.txt
+++ b/src/library/blast/CMakeLists.txt
@@ -1,2 +1,3 @@
 add_library(blast OBJECT expr.cpp state.cpp blast.cpp blast_tactic.cpp
-  init_module.cpp simplifier.cpp assumption.cpp intros.cpp proof_expr.cpp)
+  init_module.cpp simplifier.cpp assumption.cpp intros.cpp proof_expr.cpp
+  options.cpp)
diff --git a/src/library/blast/blast.cpp b/src/library/blast/blast.cpp
index a192f1f0fe..635c6c8c15 100644
--- a/src/library/blast/blast.cpp
+++ b/src/library/blast/blast.cpp
@@ -6,7 +6,6 @@ Author: Leonardo de Moura
 */
 #include <vector>
 #include "util/sstream.h"
-#include "util/sexpr/option_declarations.h"
 #include "kernel/for_each_fn.h"
 #include "kernel/type_checker.h"
 #include "library/replace_visitor.h"
@@ -24,38 +23,14 @@ Author: Leonardo de Moura
 #include "library/blast/assumption.h"
 #include "library/blast/intros.h"
 #include "library/blast/proof_expr.h"
+#include "library/blast/options.h"
 #include "library/blast/blast_exception.h"
 
-#ifndef LEAN_DEFAULT_BLAST_MAX_DEPTH
-#define LEAN_DEFAULT_BLAST_MAX_DEPTH 128
-#endif
-#ifndef LEAN_DEFAULT_BLAST_INIT_DEPTH
-#define LEAN_DEFAULT_BLAST_INIT_DEPTH 1
-#endif
-#ifndef LEAN_DEFAULT_BLAST_INC_DEPTH
-#define LEAN_DEFAULT_BLAST_INC_DEPTH 5
-#endif
-
 namespace lean {
 namespace blast {
 static name * g_prefix     = nullptr;
 static name * g_tmp_prefix = nullptr;
 
-/* Options */
-static name * g_blast_max_depth    = nullptr;
-static name * g_blast_init_depth   = nullptr;
-static name * g_blast_inc_depth    = nullptr;
-
-unsigned get_blast_max_depth(options const & o) {
-    return o.get_unsigned(*g_blast_max_depth, LEAN_DEFAULT_BLAST_MAX_DEPTH);
-}
-unsigned get_blast_init_depth(options const & o) {
-    return o.get_unsigned(*g_blast_init_depth, LEAN_DEFAULT_BLAST_INIT_DEPTH);
-}
-unsigned get_blast_inc_depth(options const & o) {
-    return o.get_unsigned(*g_blast_inc_depth, LEAN_DEFAULT_BLAST_INC_DEPTH);
-}
-
 class blastenv {
     friend class scope_assignment;
     typedef std::vector<tmp_type_context *> tmp_type_context_pool;
@@ -829,16 +804,6 @@ optional<expr> blast_goal(environment const & env, io_state const & ios, list<na
 void initialize_blast() {
     blast::g_prefix           = new name(name::mk_internal_unique_name());
     blast::g_tmp_prefix       = new name(name::mk_internal_unique_name());
-    blast::g_blast_max_depth  = new name{"blast", "max_depth"};
-    blast::g_blast_init_depth = new name{"blast", "init_depth"};
-    blast::g_blast_inc_depth  = new name{"blast", "inc_depth"};
-
-    register_unsigned_option(*blast::g_blast_max_depth, LEAN_DEFAULT_BLAST_MAX_DEPTH,
-                             "(blast) max search depth for blast");
-    register_unsigned_option(*blast::g_blast_init_depth, LEAN_DEFAULT_BLAST_INIT_DEPTH,
-                             "(blast) initial search depth for blast (remark: blast uses iteration deepening)");
-    register_unsigned_option(*blast::g_blast_inc_depth, LEAN_DEFAULT_BLAST_INC_DEPTH,
-                             "(blast) search depth increment for blast (remark: blast uses iteration deepening)");
 }
 void finalize_blast() {
     delete blast::g_prefix;
diff --git a/src/library/blast/init_module.cpp b/src/library/blast/init_module.cpp
index d7cc3496de..4513f23c27 100644
--- a/src/library/blast/init_module.cpp
+++ b/src/library/blast/init_module.cpp
@@ -9,9 +9,11 @@ Author: Leonardo de Moura
 #include "library/blast/blast.h"
 #include "library/blast/blast_tactic.h"
 #include "library/blast/simplifier.h"
+#include "library/blast/options.h"
 
 namespace lean {
 void initialize_blast_module() {
+    blast::initialize_options();
     blast::initialize_expr();
     blast::initialize_state();
     initialize_blast();
@@ -24,5 +26,6 @@ void finalize_blast_module() {
     finalize_blast();
     blast::finalize_state();
     blast::finalize_expr();
+    blast::finalize_options();
 }
 }
diff --git a/src/library/blast/options.cpp b/src/library/blast/options.cpp
new file mode 100644
index 0000000000..1e59f37bf4
--- /dev/null
+++ b/src/library/blast/options.cpp
@@ -0,0 +1,53 @@
+/*
+Copyright (c) 2015 Microsoft Corporation. All rights reserved.
+Released under Apache 2.0 license as described in the file LICENSE.
+
+Author: Leonardo de Moura
+*/
+#include "util/sexpr/option_declarations.h"
+
+#ifndef LEAN_DEFAULT_BLAST_MAX_DEPTH
+#define LEAN_DEFAULT_BLAST_MAX_DEPTH 128
+#endif
+#ifndef LEAN_DEFAULT_BLAST_INIT_DEPTH
+#define LEAN_DEFAULT_BLAST_INIT_DEPTH 1
+#endif
+#ifndef LEAN_DEFAULT_BLAST_INC_DEPTH
+#define LEAN_DEFAULT_BLAST_INC_DEPTH 5
+#endif
+
+namespace lean {
+namespace blast {
+/* Options */
+static name * g_blast_max_depth    = nullptr;
+static name * g_blast_init_depth   = nullptr;
+static name * g_blast_inc_depth    = nullptr;
+
+unsigned get_blast_max_depth(options const & o) {
+    return o.get_unsigned(*g_blast_max_depth, LEAN_DEFAULT_BLAST_MAX_DEPTH);
+}
+unsigned get_blast_init_depth(options const & o) {
+    return o.get_unsigned(*g_blast_init_depth, LEAN_DEFAULT_BLAST_INIT_DEPTH);
+}
+unsigned get_blast_inc_depth(options const & o) {
+    return o.get_unsigned(*g_blast_inc_depth, LEAN_DEFAULT_BLAST_INC_DEPTH);
+}
+
+void initialize_options() {
+    g_blast_max_depth  = new name{"blast", "max_depth"};
+    g_blast_init_depth = new name{"blast", "init_depth"};
+    g_blast_inc_depth  = new name{"blast", "inc_depth"};
+
+    register_unsigned_option(*blast::g_blast_max_depth, LEAN_DEFAULT_BLAST_MAX_DEPTH,
+                             "(blast) max search depth for blast");
+    register_unsigned_option(*blast::g_blast_init_depth, LEAN_DEFAULT_BLAST_INIT_DEPTH,
+                             "(blast) initial search depth for blast (remark: blast uses iteration deepening)");
+    register_unsigned_option(*blast::g_blast_inc_depth, LEAN_DEFAULT_BLAST_INC_DEPTH,
+                             "(blast) search depth increment for blast (remark: blast uses iteration deepening)");
+}
+void finalize_options() {
+    delete g_blast_max_depth;
+    delete g_blast_init_depth;
+    delete g_blast_inc_depth;
+}
+}}
diff --git a/src/library/blast/options.h b/src/library/blast/options.h
new file mode 100644
index 0000000000..b26f42ecae
--- /dev/null
+++ b/src/library/blast/options.h
@@ -0,0 +1,17 @@
+/*
+Copyright (c) 2015 Microsoft Corporation. All rights reserved.
+Released under Apache 2.0 license as described in the file LICENSE.
+
+Author: Leonardo de Moura
+*/
+#pragma once
+#include "util/sexpr/options.h"
+
+namespace lean {
+namespace blast {
+unsigned get_blast_max_depth(options const & o);
+unsigned get_blast_init_depth(options const & o);
+unsigned get_blast_inc_depth(options const & o);
+void initialize_options();
+void finalize_options();
+}}