diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2114601..f89f77a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -337,14 +337,12 @@ if (HAVE_AVX)
                                PROPERTIES COMPILE_FLAGS "${AVX_FLAG}")
 endif ()
 if (HAVE_AVX2)
-  set_source_files_properties (${fftw_dft_simd_avx2_SOURCE}
-                               ${fftw_rdft_simd_avx2_SOURCE}
-                               PROPERTIES COMPILE_FLAGS "${AVX2_FLAG}")
-endif ()
-if (HAVE_FMA)
-  set_source_files_properties (${fftw_dft_simd_avx2_SOURCE}
-                               ${fftw_rdft_simd_avx2_SOURCE}
-                               PROPERTIES COMPILE_FLAGS "${FMA_FLAG}")
+  set(AVX2_COMPILE_FLAGS "${AVX2_FLAG}")
+  if (HAVE_FMA)
+    string(APPEND AVX2_COMPILE_FLAGS " ${FMA_FLAG}")
+  endif ()
+  set_source_files_properties (${fftw_dft_simd_avx2_SOURCE} ${fftw_rdft_simd_avx2_SOURCE}
+							   PROPERTIES COMPILE_FLAGS "${AVX2_COMPILE_FLAGS}")
 endif ()
 if (HAVE_LIBM)
   target_link_libraries (${fftw3_lib} m)