diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4dd92f0..bfa697d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -488,7 +488,7 @@ add_definitions(-DBOOST_TEST_DYN_LINK)
 # }
 # #endif
 if (USE_OPENMP)
-  find_package(OpenMP)
+  find_package(OpenMP REQUIRED)
 endif ()
 
 if (OPENMP_FOUND)