diff --git a/external/external_build.cmake b/external/external_build.cmake
index fd62fed..401abaf 100644
--- a/external/external_build.cmake
+++ b/external/external_build.cmake
@@ -1,7 +1,7 @@
 include(FindOpenMP)
 
 OPTION(ENABLE_OPENMP "Set to Yes if Healpix and/or you need openMP" OFF)
-OPTION(SDF_SUPPORT "Set to Yes to activate support for SDF" OFF)
+OPTION(SDF_SUPPORT "Set to Yes to activate support for SDF" ON)
 
 IF(ENABLE_OPENMP)