diff --git a/src/hardware/hp-3478a/api.c b/src/hardware/hp-3478a/api.c
index edc16fc8..c87affd3 100644
--- a/src/hardware/hp-3478a/api.c
+++ b/src/hardware/hp-3478a/api.c
@@ -206,7 +206,6 @@ static int config_list(uint32_t key, GVariant **data,
 
 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 {
-	int ret;
 	struct sr_scpi_dev_inst *scpi;
 	struct dev_context *devc;