diff --git a/drivers/input/misc/rotary_encoder.c b/drivers/input/misc/rotary_encoder.c
index 4ae0793..1f8e010 100644
--- a/drivers/input/misc/rotary_encoder.c
+++ b/drivers/input/misc/rotary_encoder.c
@@ -22,6 +22,7 @@
 #include <linux/platform_device.h>
 #include <linux/gpio.h>
 #include <linux/rotary_encoder.h>
+#include <linux/slab.h>
 
 #define DRV_NAME "rotary-encoder"