diff --git a/tests/validation/reference/Convolution3d.h b/tests/validation/reference/Convolution3d.h
index 23918a4..6ac5df9 100644
--- a/tests/validation/reference/Convolution3d.h
+++ b/tests/validation/reference/Convolution3d.h
@@ -21,8 +21,8 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-#ifndef __ARM_COMPUTE_TEST_VALIDATION_CONVOLUTION_H__
-#define __ARM_COMPUTE_TEST_VALIDATION_CONVOLUTION_H__
+#ifndef ARM_COMPUTE_TEST_VALIDATION_CONVOLUTION_H
+#define ARM_COMPUTE_TEST_VALIDATION_CONVOLUTION_H
 
 #include "arm_compute/core/utils/quantization/AsymmHelpers.h"
 #include "tests/validation/Helpers.h"
@@ -133,7 +133,7 @@
     int         output_multiplier = 0;
     int         output_shift      = 0;
     const float multiplier        = input_scale * weights_scale / output_scale;
-    arm_compute::quantization::calculate_quantized_multiplier_less_than_one(multiplier, &output_multiplier, &output_shift);
+    arm_compute::quantization::calculate_quantized_multiplier(multiplier, &output_multiplier, &output_shift);
 
     const int half_width_weights_start  = width_weights / 2;
     const int half_width_weights_end    = ((width_weights % 2) == 0) ? (half_width_weights_start - 1) : half_width_weights_start;
@@ -171,9 +171,8 @@
     // Accumulate the bias
     acc += (*b_ptr);
 
-    acc = validation::asymm_rounding_divide_by_pow2(validation::asymm_int_mult(acc, output_multiplier), output_shift);
-    acc += output_offset;
-    acc = utility::clamp<int32_t>(acc, 0, 255);
+    // Quantize down
+    acc = validation::quantize_down_scale_by_fixedpoint(acc, output_multiplier, output_shift, output_offset, 0, 255);
 
     // Store the result
     *out_ptr = acc;
@@ -182,4 +181,4 @@
 } // namespace convolution_3d
 } // namespace test
 } // namespace arm_compute
-#endif /*__ARM_COMPUTE_TEST_VALIDATION_CONVOLUTION_H__ */
+#endif /* ARM_COMPUTE_TEST_VALIDATION_CONVOLUTION_H */