It's not St. Patrick's Day until you've got your green and gold "Make America Great Again" hat securely on your head.

That's why the GOP and Donald Trump's team have been pushing sales of the $50 hat since last week — to make sure you show your Trump support and avoid getting pinched when the Irish holiday rolls around on March 17.

The only problem? As people on Twitter pointed out, the hat features a four-leaf clover 🍀. St. Patrick's Day, however, is all about shamrocks ☘, which have three leaves.

☘️= shamrock

🍀= four leaf clover



Don't mess it up, #marketing geeks, for #StPatricksDay — Barbara Kolbe Baker (@BarbaraKB) March 6, 2017

@realDonaldTrump it's the shamrock, not 4 leaf clover that is Irish National symbol. Your Green MAGA hat is an #epic fail. Picture for info pic.twitter.com/CGLdVRm6t7 — Declan Smyth (@deccosmyth) March 3, 2017

The Shamrock is trefoil, the four leaf clover has nothing to do with Ireland. #fail #doyourresearch @TeamTrump — Stephen Macken (@stevemacken) March 4, 2017

Make America Stupid Again by buying a hat with a clover instead of a shamrock. #MASA https://t.co/wZiKW0jayo — Captain Blue (@CaptainBlue) March 6, 2017

Sorry to inform you Donald but that's a clover not a shamrock... #alternativefacts ☘☘ https://t.co/IWQxwNALz2 — emma♡ (@emmie_heneghan) March 6, 2017

Clearly Trump didn't have a primary school teacher who showed him how to draw a proper shamrock and not a 4 leaf clover #shamrockgate https://t.co/IUh6GF0yvj — Meme Carton (@MemeCarton) March 6, 2017

While this mistake isn't new, Trump's team did make the hat especially for St. Patrick's Day, so a little research could have gone a long way.

There's always next year to make their hats great again.