diff --git a/spa/plugins/audioconvert/resample.c b/spa/plugins/audioconvert/resample.c
index 33f4e6dfd..32e3f8f4e 100644
--- a/spa/plugins/audioconvert/resample.c
+++ b/spa/plugins/audioconvert/resample.c
@@ -844,9 +844,10 @@ static int impl_node_process(void *object)
 		 !SPA_FLAG_IS_SET(this->io_rate_match->flags, SPA_IO_RATE_MATCH_FLAG_ACTIVE));
 
 	if (passthrough) {
+		uint32_t len = SPA_MIN(in_len, out_len);
 		for (i = 0; i < sb->n_datas; i++)
-			memcpy(dst_datas[i], src_datas[i], in_len * sizeof(float));
-		out_len = in_len;
+			memcpy(dst_datas[i], src_datas[i], len * sizeof(float));
+		out_len = in_len = len;
 	} else {
 		resample_process(&this->resample, src_datas, &in_len, dst_datas, &out_len);
 	}