diff --git a/src/audio/tdfb/tdfb_generic.c b/src/audio/tdfb/tdfb_generic.c
index a8dbdd999..7e8df014e 100644
--- a/src/audio/tdfb/tdfb_generic.c
+++ b/src/audio/tdfb/tdfb_generic.c
@@ -40,8 +40,9 @@ static inline void tdfb_core(struct tdfb_comp_data *cd, int in_nch, int out_nch)
 		 * two samples per call. The output is stored as Q5.27
 		 * to fit max. 16 filters sum to a channel.
 		 */
-		y0 = fir_32x16(filter, cd->in[is]) >> 4;
-		y1 = fir_32x16(filter, cd->in[is2]) >> 4;
+		fir_32x16_2x(filter, cd->in[is], cd->in[is2], &y0, &y1);
+		y0 >>= 4;
+		y1 >>= 4;
 		for (k = 0; k < out_nch; k++) {
 			if (om & 1) {
 				cd->out[k] += y0;