diff --git a/src/scpi/scpi.c b/src/scpi/scpi.c
index f743f64d..f87bf9eb 100644
--- a/src/scpi/scpi.c
+++ b/src/scpi/scpi.c
@@ -448,9 +448,9 @@ SR_PRIV int sr_scpi_get_data(struct sr_scpi_dev_inst *scpi,
 			return SR_ERR;
 		} else if (len > 0) {
 			laststart = g_get_monotonic_time();
-			offset += len;
-			g_string_set_size(response, offset);
 		}
+		offset += len;
+		g_string_set_size(response, offset);
 		elapsed_ms = (g_get_monotonic_time() - laststart) / 1000;
 		if (elapsed_ms >= scpi->read_timeout_ms) {
 			sr_err("Timed out waiting for SCPI response.");