diff --git a/src/spreadinterp.cpp b/src/spreadinterp.cpp
index 62e64ffca..2ebfededd 100644
--- a/src/spreadinterp.cpp
+++ b/src/spreadinterp.cpp
@@ -1255,7 +1255,7 @@ void add_wrapped_subgrid(BIGINT offset1, BIGINT offset2, BIGINT offset3, BIGINT
 */
 {
   std::vector<BIGINT> o2(size2), o3(size3);
-  static constexpr auto accumulate = [](FLT& a, FLT b) {
+  static auto accumulate = [](FLT& a, FLT b) {
     if constexpr (thread_safe) { // NOLINT(*-branch-clone)
 #pragma omp atomic
       a += b;