diff --git a/src/main.c b/src/main.c
index 82c27f9..230a8e5 100644
--- a/src/main.c
+++ b/src/main.c
@@ -51,7 +51,7 @@ static void system_clock_init(void) {
 
   // Wait indefinitely for PLL to be ready
   // TODO indicate error/timeout somehow?
-  while (!(RCC->CR & RCC_CR_HSERDY_READY));
+  while (!(RCC->CR & RCC_CR_PLLRDY_LOCKED));
 
   // Enable caching of instructions and data
   FLASH->ACR |= FLASH_ACR_DCEN_ENABLE;