diff --git a/CMakeLists.txt b/CMakeLists.txt
index f6187672..db6280fb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -62,7 +62,7 @@ set(CMAKE_FIND_PACKAGE_SORT_DIRECTION DEC)
 
 find_package(MPI REQUIRED COMPONENTS C CXX)
 find_package(OpenMP)
-find_package(FFTW)
+find_package(FFTW REQUIRED)
 find_package(HDF5 COMPONENTS C CXX HL REQUIRED)
 find_package(TIRPC)	       # Check for alternative Sun rpc support
 find_package(Eigen3 REQUIRED)