diff --git a/lib/orogen/gen/typekit.rb b/lib/orogen/gen/typekit.rb
index ebde2c1d..1550e0fe 100644
--- a/lib/orogen/gen/typekit.rb
+++ b/lib/orogen/gen/typekit.rb
@@ -1504,7 +1504,7 @@ def perform_pending_loads
                     lines.map! { |inc| pending_loads_to_relative[inc] }
                 end
 
-                Tempfile.open("orogen-pending-loads_") do |io|
+                Tempfile.open(["orogen-pending-loads_",".hpp"]) do |io|
                     io.write preprocessed
                     io.flush