diff --git a/lib/execjs/ruby_racer_runtime.rb b/lib/execjs/ruby_racer_runtime.rb
index fab327e..879e8bb 100644
--- a/lib/execjs/ruby_racer_runtime.rb
+++ b/lib/execjs/ruby_racer_runtime.rb
@@ -31,7 +31,7 @@ module ExecJS
               if e.value["name"] == "SyntaxError"
                 raise RuntimeError, e.message
               else
-                raise ProgramError, e.message
+                raise ProgramError, e.value.to_s
               end
             end
           end