1 files changed, 1 insertions, 1 deletions
diff --git a/ext/dl/lib/dl/import.rb b/ext/dl/lib/dl/import.rb
index aab0a38d52..199354c18e 100644
--- a/ext/dl/lib/dl/import.rb
+++ b/ext/dl/lib/dl/import.rb
@@ -87,7 +87,7 @@ module DL
           raise(DLError, "unknown type: #{ty}")
         end
       when Class
-        if( ty.instance_methods().include?("to_ptr") )
+        if( ty.instance_methods().include?(:to_ptr) )
           return ty.size()
         end
       end