diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 4587da982b4..4c6e926d93f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2020-01-08  David Malcolm  <dmalcolm@redhat.com>
+
+	* sbitmap.h (auto_sbitmap): Add operator const_sbitmap.
+
 2020-01-08  Jim Wilson  <jimw@sifive.com>
 
 	* config/riscv/riscv.c (riscv_legitimize_tls_address): Ifdef out
diff --git a/gcc/sbitmap.h b/gcc/sbitmap.h
index e3f514f0ebf..9c4215db29b 100644
--- a/gcc/sbitmap.h
+++ b/gcc/sbitmap.h
@@ -295,6 +295,7 @@ public:
 
   /* Allow calling sbitmap functions on our bitmap.  */
   operator sbitmap () { return m_bitmap; }
+  operator const_sbitmap () const { return m_bitmap; }
 
 private:
   /* Prevent making a copy that refers to our sbitmap.  */