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To celebrate Canada’s 150th birthday, Prime Minister Justin Trudeau gave a speech to a cheering crowd in Ottawa Saturday, highlighting the diversity and kinship of all the provinces and territories.

However, he failed to mention one major Canadian province in his speech — Alberta.

READ MORE: Naheed Nenshi says outrage over Justin Trudeau’s perceived speech gaffe is ‘just silly’

“We may live in British Columbia, Yukon, the Northwest Territories, Saskatchewan, Manitoba, Nunavut, Ontario, Quebec, New Brunswick, Prince Edward Island, Nova Scotia or Newfoundland or Labrador…but we embrace that diversity while knowing in our hearts we are all Canadians,” he said during his speech at Rideau Hall.

WATCH: Prime Minister Justin Trudeau was quick to repair his mistake of not mentioning Alberta in his 150th birthday Canada Day speech.

0:16 Trudeau apologizes for failing to mention Alberta in Canada 150 speech Trudeau apologizes for failing to mention Alberta in Canada 150 speech

Within minutes of this, people took to social media to point out the mistake. Some saw it as a harmless mistake while others took it a little more to heart.

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Trudeau forgot to mention Alberta.

Commence the conspiracy theories! #Canada150 — Dale Smith (@journo_dale) July 1, 2017

Terrible. Trudeau just named every province and territory…except Alberta. pic.twitter.com/LqPn9as1v3 — Spencer Fernando🇨🇦 (@SpencerFernando) July 1, 2017

I'm sure Trudeau missing Alberta was 100% unintentional, but the overreaction is going to be great. — Justin (@justin_sens) July 1, 2017

In his celebratory #Canada150 address Justin Trudeau forgot to mention the province of Alberta with its population of over 4 million people — Morehu Rei (@MorehuR) July 1, 2017

Coincidence, I’m sure. 🤔 “@Canadabuster: Trudeau missed naming Alberta in speech, wow.” — gab.ai/JustSheila (@_FreeMarketeer) July 1, 2017

For all you people whining that PM Trudeau forgot Alberta – RELAX. #peoplemakemistakes #HappyCanadaDay #mycountryincludesAlberta — Jacqueline Roy (@jacroy67) July 1, 2017

READ MORE: A wet but festive Canada 150 celebration on Parliament Hill

Trudeau went on Twitter and apologized to Albertans for the mistake.

WATCH: Canada celebrates its 150th birthday

2:20 Canada celebrates its 150th birthday Canada celebrates its 150th birthday