diff --git a/arch/arm/src/stm32/stm32g4xxxx_rcc.c b/arch/arm/src/stm32/stm32g4xxxx_rcc.c
index bc1b6303b533e..ed213cb0c1f97 100644
--- a/arch/arm/src/stm32/stm32g4xxxx_rcc.c
+++ b/arch/arm/src/stm32/stm32g4xxxx_rcc.c
@@ -702,7 +702,7 @@ static inline bool stm32_rcc_enablepll(void)
   /* Preserve reserved bits when altering the PLLCFGR register */
 
   regval = getreg32(STM32_RCC_PLLCFGR);
-  regval &= ~(RCC_PLLCFGR_RESERVED_MASK);
+  regval &= RCC_PLLCFGR_RESERVED_MASK;
 
   /* Configure PLL source and enables */