McDonald’s has been forced to cancel plans for a bargain Big Mac promotion celebrating 30 years since the opening of its first restaurant in Russia due to coronavirus fears.

The U.S. fast food chain had been planning to sell Big Macs for the symbolic price of 3 rubles ($0.05) all day Friday at its first Russian restaurant on Pushkin Square in central Moscow. Three rubles represents the price of a Big Mac when the restaurant first opened on Jan. 31, 1990 — around half a day’s wages for the average Soviet worker at the time.

However, McDonald’s said it was canceling the plans for cut-price Big Macs on advice from the Russian government that large public events posed a risk of the virus spreading.