diff --git a/bme680.h b/bme680.h
index 2fff9f0..16fb697 100644
--- a/bme680.h
+++ b/bme680.h
@@ -50,7 +50,7 @@ struct bme680_dev {
 	int (*init)   (void);
 	int (*read)   (uint8_t reg, uint8_t *dst, uint32_t size);
 	int (*write)  (uint8_t reg, uint8_t value);
-	int (*sleep)  (uint32_t dur_ms);
+	int (*sleep)  (uint32_t dur_us);
 	int (*deinit) (void);
 };