Party City announced Thursday that it will be shuttering 45 of its 870 stores this year amid a global helium shortage.

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The party supplies giant’s CEO James Harrison said in a statement that Party City closes 10 to 15 stores each year “as a part of our prudent network optimization process and in response to ongoing consumer, market and economic changes that naturally arise in the business.”

Harrison also said that the helium shortage “negatively impacted our latex and metallic balloon categories.”

Ticker Security Last Change Change % PRTY PARTY CITY HOLDCO INC 2.80 -0.39 -12.23%

Domestically, helium reserves are being depleted while overall demand has risen. Likewise, about 75 percent of all helium come from three suppliers, according to USA Today.

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Party City said in the statement that they were working on getting “a new source of helium,” which they hope will help them with latex and metallic balloon sales.

The company did not announce which stores would be closing.