diff --git a/debian/qualify-clang.sh b/debian/qualify-clang.sh
index 83d60af9..2162f732 100644
--- a/debian/qualify-clang.sh
+++ b/debian/qualify-clang.sh
@@ -35,6 +35,14 @@ clang-$VERSION foo.c
 echo '#include <stddef.h>' > foo.c
 clang-$VERSION -c foo.c
 
+# bug 903709
+echo '#include <stdatomic.h>
+void increment(atomic_size_t *arg) {
+    atomic_fetch_add(arg, 1);
+} ' > foo.c
+
+clang-$VERSION -v -c foo.c
+
 echo "#include <fenv.h>" > foo.cc
 NBLINES=$(clang++-$VERSION -P -E foo.cc|wc -l)
 if test $NBLINES -lt 100; then