diff --git a/lib/stm32/l1/rcc.c b/lib/stm32/l1/rcc.c
index 106032a3..559711d3 100644
--- a/lib/stm32/l1/rcc.c
+++ b/lib/stm32/l1/rcc.c
@@ -515,9 +515,6 @@ void rcc_clock_setup_pll(const clock_scale_t *clock)
 	rcc_osc_on(HSI);
 	rcc_wait_for_osc_ready(HSI);
 
-	/* Select HSI as SYSCLK source. */
-	rcc_set_sysclk_source(RCC_CFGR_SW_SYSCLKSEL_HSICLK);
-
 	/*
 	 * Set prescalers for AHB, ADC, ABP1, ABP2.
 	 * Do this before touching the PLL (TODO: why?).