diff --git a/xxhash.changes b/xxhash.changes
index 3bd84eb..f649eba 100644
--- a/xxhash.changes
+++ b/xxhash.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Mon Dec 20 10:27:32 UTC 2021 - Dirk Müller <dmueller@suse.com>
+
+- fix racy check execution 
+
 -------------------------------------------------------------------
 Thu Dec  2 22:20:24 UTC 2021 - Dirk Müller <dmueller@suse.com>
 
diff --git a/xxhash.spec b/xxhash.spec
index 59d4207..2a89a4b 100644
--- a/xxhash.spec
+++ b/xxhash.spec
@@ -67,7 +67,8 @@ functions. Hashes are identical on all platforms.
 rm -rf %{buildroot}%{_libdir}/libxxhash.a
 
 %check
-%make_build test
+# not safe for parallel execution as it removes xxhash.o and recreates it with different flags
+%make_build -j1 test
 
 %post -n libxxhash0 -p /sbin/ldconfig
 %postun -n libxxhash0 -p /sbin/ldconfig