diff --git a/src/dbm/dbm_multiply.c b/src/dbm/dbm_multiply.c
index c723082f2f..47f0282f78 100644
--- a/src/dbm/dbm_multiply.c
+++ b/src/dbm/dbm_multiply.c
@@ -280,7 +280,7 @@ static void multiply_packs(const bool transa, const bool transb,
 
             // Count flops.
             dbm_library_counter_increment(m, n, k);
-            const int task_flops = 2 * m * n * k;
+            const int64_t task_flops = 2LL * m * n * k;
             flop_sum += task_flops;
             if (task_flops == 0) {
               continue;