diff --git a/test/client/Makefile b/test/client/Makefile
index a4e4992c..3acb8525 100644
--- a/test/client/Makefile
+++ b/test/client/Makefile
@@ -1,4 +1,5 @@
 .PHONY: all check test ptest clean
+.NOTPARALLEL:
 
 all :