diff --git a/src/library/blast/blast.cpp b/src/library/blast/blast.cpp
index ca50bf29f..db5cf668e 100644
--- a/src/library/blast/blast.cpp
+++ b/src/library/blast/blast.cpp
@@ -457,6 +457,10 @@ public:
         name_map<expr> local2href;
         return to_blast_expr_fn(m_env, m_curr_state, m_uvar2uref, m_mvar2meta_mref, local2href)(e);
     }
+
+    app_builder & get_app_builder() {
+        return m_app_builder;
+    }
 };
 
 LEAN_THREAD_PTR(blastenv, g_blastenv);
@@ -477,6 +481,11 @@ io_state const & ios() {
     return g_blastenv->get_ios();
 }
 
+app_builder & get_app_builder() {
+    lean_assert(g_blastenv);
+    return g_blastenv->get_app_builder();
+}
+
 state & curr_state() {
     lean_assert(g_blastenv);
     return g_blastenv->get_curr_state();
diff --git a/src/library/blast/blast.h b/src/library/blast/blast.h
index cc2df029d..27145b4ed 100644
--- a/src/library/blast/blast.h
+++ b/src/library/blast/blast.h
@@ -22,6 +22,8 @@ namespace blast {
 environment const & env();
 /** \brief Return the thread local io_state being used by the blast tactic. */
 io_state const & ios();
+/** \brief Return reference to blast thread local app_builder */
+app_builder & get_app_builder();
 /** \brief Return the thread local current state begin processed by the blast tactic. */
 state & curr_state();
 /** \brief Return a thread local fresh local constant. */