diff --git a/firmware/setup/system_init.c b/firmware/setup/system_init.c
index 6b823c2..8919baa 100644
--- a/firmware/setup/system_init.c
+++ b/firmware/setup/system_init.c
@@ -93,7 +93,7 @@ void __setup_clocks(void)
 	RCC->CFGR = tmp;
 
 	/* Turn off HSI */
-	RCC->CR &= ~RCC_CR_HSEON;
+	RCC->CR &= ~RCC_CR_HSION;
 }
 
 void __system_init(void)