diff --git a/Modules/FindOpenMP.cmake b/Modules/FindOpenMP.cmake
index 3f8f61a122..95e5cdc1f7 100644
--- a/Modules/FindOpenMP.cmake
+++ b/Modules/FindOpenMP.cmake
@@ -125,6 +125,7 @@ set(OpenMP_C_CXX_TEST_SOURCE
 #include <omp.h>
 int main() {
 #ifdef _OPENMP
+  int n = omp_get_max_threads();
   return 0;
 #else
   breaks_on_purpose