diff --git a/cpu/stm32/periph/gpio_ll_irq.c b/cpu/stm32/periph/gpio_ll_irq.c
index 436cde4651a70..5e9d83d5b15e9 100644
--- a/cpu/stm32/periph/gpio_ll_irq.c
+++ b/cpu/stm32/periph/gpio_ll_irq.c
@@ -84,10 +84,8 @@
 #ifdef RCC_APB2ENR_SYSCFGCOMPEN
 #  define SYSFG_CLOCK           APB2
 #  define SYSFG_ENABLE_MASK     RCC_APB2ENR_SYSCFGCOMPEN
-#endif
-
-#ifdef  RCC_APBENR2_SYSCFGEN
-#  define SYSFG_ENABLE_MASK     RCC_APBENR2_SYSCFGEN
+#elif defined(RCC_APB2ENR_SYSCFGEN)
+#  define SYSFG_ENABLE_MASK     RCC_APB2ENR_SYSCFGEN
 #  ifdef APB12
 #    define SYSFG_CLOCK         APB12
 #  else
@@ -106,6 +104,9 @@
 
 #ifdef SYSCFG_EXTICR1_EXTI0
 #  define EXTICR_REG(num)       (SYSCFG->EXTICR[(num) >> 2])
+#  ifndef SYSFG_CLOCK
+#    error "SYSFG_CLOCK not defined, but EXTICR reg is in SYSFG"
+#  endif
 #endif
 
 #ifdef AFIO_EXTICR1_EXTI0