diff --git a/src/modules/module-filter-chain/dsp-ops-c.c b/src/modules/module-filter-chain/dsp-ops-c.c
index 68b3080e8..30fe8be18 100644
--- a/src/modules/module-filter-chain/dsp-ops-c.c
+++ b/src/modules/module-filter-chain/dsp-ops-c.c
@@ -63,9 +63,6 @@ void dsp_mix_gain_c(struct dsp_ops *ops,
 	uint32_t i;
 	if (n_src == 0) {
 		dsp_clear_c(ops, dst, n_samples);
-	} else if (n_src == 1) {
-		if (dst != src[0])
-			dsp_copy_c(ops, dst, src[0], n_samples);
 	} else {
 		if (gain[0] == 1.0f)
 			dsp_copy_c(ops, dst, src[0], n_samples);
diff --git a/src/modules/module-filter-chain/dsp-ops-sse.c b/src/modules/module-filter-chain/dsp-ops-sse.c
index 4821303d7..9eb94f794 100644
--- a/src/modules/module-filter-chain/dsp-ops-sse.c
+++ b/src/modules/module-filter-chain/dsp-ops-sse.c
@@ -19,7 +19,7 @@ void dsp_mix_gain_sse(struct dsp_ops *ops,
 {
 	if (n_src == 0) {
 		memset(dst, 0, n_samples * sizeof(float));
-	} else if (n_src == 1) {
+	} else if (n_src == 1 && gain[0] == 1.0f) {
 		if (dst != src[0])
 			spa_memcpy(dst, src[0], n_samples * sizeof(float));
 	} else {