diff --git a/CMakeLists.txt b/CMakeLists.txt
index 33f59f311..92722dcb7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1093,7 +1093,7 @@ target_link_libraries (wsjt_fort  ${FFTW3_LIBRARIES})
 if (${OPENMP_FOUND} OR APPLE)
   add_library (wsjt_fort_omp STATIC ${wsjt_FSRCS})
   target_link_libraries (wsjt_fort_omp  ${FFTW3_LIBRARIES})
-  if (OpenMP_C_FLAGS)
+  if (OpenMP_C_FLAGS AND NOT APPLE)
     set_target_properties (wsjt_fort_omp
       PROPERTIES
       COMPILE_FLAGS "${OpenMP_C_FLAGS}"