diff --git a/fft/src/KokkosFFT_OpenMP_plans.hpp b/fft/src/KokkosFFT_OpenMP_plans.hpp
index fe7d5e5a..50464c83 100644
--- a/fft/src/KokkosFFT_OpenMP_plans.hpp
+++ b/fft/src/KokkosFFT_OpenMP_plans.hpp
@@ -12,7 +12,7 @@
 namespace KokkosFFT {
 namespace Impl {
 template <typename ExecutionSpace, typename T>
-void _init_threads(const ExecutionSpace& exec_space) {
+void _init_threads([[maybe_unused]] const ExecutionSpace& exec_space) {
 #if defined(KOKKOS_ENABLE_OPENMP) || defined(KOKKOS_ENABLE_THREADS)
   int nthreads = exec_space.concurrency();