diff --git a/cmake/dependencies.cmake b/cmake/dependencies.cmake
index f3b5cba46..3a35106de 100644
--- a/cmake/dependencies.cmake
+++ b/cmake/dependencies.cmake
@@ -396,7 +396,6 @@ set(HAVE_SZ ${Szip_FOUND})
 set(USE_SZIP ${HAVE_SZ})
 set_std_filter(Blosc)
 if(Zstd_FOUND)
-  #set(STD_FILTERS "${STD_FILTERS} zstd")
   set_std_filter(Zstd)
 endif()
 if(Bz2_FOUND)
@@ -408,7 +407,8 @@ else()
   set(HAVE_BZ2 ON CACHE BOOL "")
   set(STD_FILTERS "${STD_FILTERS} bz2")
 endif()
-set(STD_FILTERS ${STD_FILTERS} ${FOUND_STD_FILTERS})
+
+set(STD_FILTERS "${STD_FILTERS}${FOUND_STD_FILTERS}")
 IF (NETCDF_ENABLE_NCZARR_ZIP)
   find_package(Zip)
   if(Zip_FOUND)