diff --git a/parse.y b/parse.y
index b904797969..b56e33b4f6 100644
--- a/parse.y
+++ b/parse.y
@@ -3796,7 +3796,7 @@ sym		: fname
 		| tCVAR
 		;
 
-dsym		: tSYMBEG xstring_contents tSTRING_END
+dsym		: tSYMBEG string_contents tSTRING_END
 		    {
 			SET_LEX_STATE(EXPR_END);
 		    /*%%%*/
diff --git a/test/ripper/test_sexp.rb b/test/ripper/test_sexp.rb
index 064c0f1536..d63464d5a7 100644
--- a/test/ripper/test_sexp.rb
+++ b/test/ripper/test_sexp.rb
@@ -132,4 +132,12 @@ eot
       end
     end
   end
+
+  def test_dsym
+    bug15670 = '[ruby-core:91852]'
+    _, (_, _, s) = Ripper.sexp_raw(%q{:"sym"})
+    assert_equal([:dyna_symbol, [:string_add, [:string_content], [:@tstring_content, "sym", [1, 2]]]],
+                 s,
+                 bug15670)
+  end
 end if ripper_test