diff --git a/include/libopencm3/stm32/exti.h b/include/libopencm3/stm32/exti.h
index 48065b9a..6ecd0b67 100644
--- a/include/libopencm3/stm32/exti.h
+++ b/include/libopencm3/stm32/exti.h
@@ -71,6 +71,7 @@ void exti_enable_request(u32 extis);
 void exti_disable_request(u32 extis);
 void exti_reset_request(u32 extis);
 void exti_select_source(u32 exti, u32 gpioport);
+u32 exti_get_flag_status(u32 exti);
 
 END_DECLS
 
diff --git a/lib/stm32/f1/exti.c b/lib/stm32/f1/exti.c
index ecb58b83..50862745 100644
--- a/lib/stm32/f1/exti.c
+++ b/lib/stm32/f1/exti.c
@@ -65,6 +65,14 @@ void exti_reset_request(u32 extis)
 	EXTI_PR |= extis;
 }
 
+/*
+ * Check the flag of a given EXTI interrupt.
+ * */
+u32 exti_get_flag_status(u32 exti)
+{
+	return EXTI_PR & exti;
+}
+
 /*
  * Remap an external interrupt line to the corresponding pin on the
  * specified GPIO port.