diff --git a/src/main.c b/src/main.c
index d4b3d31..7edc5a3 100644
--- a/src/main.c
+++ b/src/main.c
@@ -70,9 +70,8 @@ static inline void clk_init()
                     LL_IOP_GRP1_PERIPH_GPIOB |
                     LL_IOP_GRP1_PERIPH_GPIOF;
 
-    RCC->AHBENR  = LL_AHB1_GRP1_PERIPH_DMA1;
     RCC->APBENR1 = LL_APB1_GRP1_PERIPH_TIM3;
-    RCC->APBENR2 = LL_APB1_GRP2_PERIPH_ADC1 | LL_APB1_GRP2_PERIPH_SYSCFG;
+    RCC->APBENR2 = LL_APB1_GRP2_PERIPH_ADC1;
 }
 
 static inline void systick_init()