diff --git a/drivers/rng/stm32mp1_rng.c b/drivers/rng/stm32mp1_rng.c
index a9a9273..7ef7ff9 100644
--- a/drivers/rng/stm32mp1_rng.c
+++ b/drivers/rng/stm32mp1_rng.c
@@ -9,6 +9,7 @@
 #include <log.h>
 #include <reset.h>
 #include <rng.h>
+#include <linux/bitops.h>
 #include <linux/delay.h>
 
 #include <asm/io.h>