diff --git a/internal/ceres/parallel_for_test.cc b/internal/ceres/parallel_for_test.cc
index 857a1b0..46f5a0f 100644
--- a/internal/ceres/parallel_for_test.cc
+++ b/internal/ceres/parallel_for_test.cc
@@ -109,7 +109,7 @@
         0,
         size,
         kNumThreads,
-        [&failed](std::tuple<int, int> range) {
+        [&failed, kMinBlockSize](std::tuple<int, int> range) {
           auto [start, end] = range;
           if (end - start < kMinBlockSize) failed = true;
         },