diff --git a/bison.changes b/bison.changes
index b86e31b..31c43f8 100644
--- a/bison.changes
+++ b/bison.changes
@@ -4,6 +4,7 @@ Tue May 28 08:43:17 UTC 2019 - Martin Pluskal <mpluskal@suse.com>
 - Update to version 3.4.1
   * Multiple changes, mostly bugfixes - see provided NEWS for
     details
+- Do not run any tests in parallel - this caused random failures
 
 -------------------------------------------------------------------
 Sat Feb 16 06:45:57 UTC 2019 - Bernhard Wiedemann <bwiedemann@suse.com>
diff --git a/bison.spec b/bison.spec
index acf7196..b6600f5 100644
--- a/bison.spec
+++ b/bison.spec
@@ -63,6 +63,7 @@ Bison is a parser generator similar to yacc(1).
 %endif
 
 %check
+# Tests dont work reliably in parallel
 make --jobs=1 check
 
 %install