diff --git a/src/audio/tdfb/tdfb_direction.c b/src/audio/tdfb/tdfb_direction.c
index 49ad5fdfe..a3282b5cc 100644
--- a/src/audio/tdfb/tdfb_direction.c
+++ b/src/audio/tdfb/tdfb_direction.c
@@ -403,8 +403,11 @@ static void theoretical_time_differences(struct tdfb_comp_data *cd, int16_t az)
 
 	for (i = 0; i < n_mic - 1; i++) {
 		delta_d = d[i + 1] - d[0]; /* Meters Q4.12 */
+		/*  Multiply delta_d (Q4.12) by RECIPROCAL_SPEED_OF_SOUND_Q31 (Q1.31) and
+		 * right-shift the result by 12 bits to preserve the Q1.31 format.
+		 */
 		cd->direction.timediff_iter[i] =
-			(int32_t)((((int64_t)delta_d) << 19) / SPEED_OF_SOUND);
+			Q_MULTS_32X32((int64_t)delta_d, RECIPROCAL_SPEED_OF_SOUND_Q31, 12, 31, 31);
 	}
 }
 
diff --git a/src/include/sof/math/numbers.h b/src/include/sof/math/numbers.h
index 1fd61f632..0cd9314f4 100644
--- a/src/include/sof/math/numbers.h
+++ b/src/include/sof/math/numbers.h
@@ -117,5 +117,6 @@ uint32_t crc32(uint32_t base, const void *data, uint32_t bytes);
 
 /* Speed of sound (m/s) in 20 C temperature at standard atmospheric pressure */
 #define SPEED_OF_SOUND		343
+#define RECIPROCAL_SPEED_OF_SOUND_Q31 6260885 /* Q1.31 */
 
 #endif /* __SOF_MATH_NUMBERS_H__ */