diff --git a/configure.ac b/configure.ac
index 909bfe50ad1b1d423cd7b180c1fd64229595bba1..3558f24a944977b0508abef0e847721d6b711d02 100644
--- a/configure.ac
+++ b/configure.ac
@@ -92,6 +92,7 @@ if test "$with_csds" = "yes"; then
    fi
 
    AC_CONFIG_SUBDIRS([csds])
+   CFLAGS="$CFLAGS -fopenmp"
 
 fi
 AM_CONDITIONAL([HAVECSDS],[test $with_csds = "yes"])