diff --git a/common_audio/signal_processing/filter_ar_fast_q12.c b/common_audio/signal_processing/filter_ar_fast_q12.c
index 0767651a74..df9e51889a 100644
--- a/common_audio/signal_processing/filter_ar_fast_q12.c
+++ b/common_audio/signal_processing/filter_ar_fast_q12.c
@@ -25,8 +25,8 @@ void WebRtcSpl_FilterARFastQ12(const int16_t* data_in,
   RTC_DCHECK_GT(coefficients_length, 1);
 
   for (i = 0; i < data_length; i++) {
-    int32_t output = 0;
-    int32_t sum = 0;
+    int64_t output = 0;
+    int64_t sum = 0;
 
     for (j = coefficients_length - 1; j > 0; j--) {
       sum += coefficients[j] * data_out[i - j];