diff --git a/hwdriver.c b/hwdriver.c
index 9535b053..bf473da6 100644
--- a/hwdriver.c
+++ b/hwdriver.c
@@ -317,7 +317,7 @@ SR_PRIV struct sr_config *sr_config_make(int key, const void *value)
  *         but this is not to be flagged as an error by the caller; merely
  *         as an indication that it's not applicable.
  */
-SR_API int sr_config_get(struct sr_dev_driver *driver, int key,
+SR_API int sr_config_get(const struct sr_dev_driver *driver, int key,
 		const void **data, const struct sr_dev_inst *sdi)
 {
 	int ret;
diff --git a/proto.h b/proto.h
index bed62698..cf99d1bb 100644
--- a/proto.h
+++ b/proto.h
@@ -68,7 +68,7 @@ SR_API struct sr_dev_driver **sr_driver_list(void);
 SR_API int sr_driver_init(struct sr_context *ctx,
 		struct sr_dev_driver *driver);
 SR_API GSList *sr_driver_scan(struct sr_dev_driver *driver, GSList *options);
-SR_API int sr_config_get(struct sr_dev_driver *driver, int key,
+SR_API int sr_config_get(const struct sr_dev_driver *driver, int key,
 		const void **data, const struct sr_dev_inst *sdi);
 SR_API int sr_config_set(const struct sr_dev_inst *sdi, int key,
 		const void *value);