diff --git a/kicad_lib.rb b/kicad_lib.rb
index 802da24..c996e38 100755
--- a/kicad_lib.rb
+++ b/kicad_lib.rb
@@ -87,5 +87,5 @@ end
 
 puts "writing KiCad database library file to #{KICAD_FILE}"
 File.open(KICAD_FILE, "w") do |file|
-  file.write kicad_dbl.to_json
+  file.write JSON.pretty_generate(kicad_dbl)
 end