diff --git a/build-aux/check.mk b/build-aux/check.mk
index 2b72a51c..8b594021 100644
--- a/build-aux/check.mk
+++ b/build-aux/check.mk
@@ -1,28 +1,28 @@
 #
 # Copyright (C) 2012-2017 Red Hat, Inc.  All rights reserved.
 #
 # Author: Fabio M. Di Nitto <fabbione@kronosnet.org>
 #
 # This software licensed under GPL-2.0+, LGPL-2.0+
 #
 
 VALGRIND = $(VALGRIND_EXEC) -q --error-exitcode=127 --gen-suppressions=all
 
-MEMCHECK = $(VALGRIND) --track-fds=yes --leak-check=full --suppressions=$(abs_top_srcdir)/build-aux/knet_valgrind_memcheck.supp
+MEMCHECK = $(VALGRIND) --track-fds=yes --leak-check=full --alignment=16 --suppressions=$(abs_top_srcdir)/build-aux/knet_valgrind_memcheck.supp
 HELGRIND = $(VALGRIND) --tool=helgrind --suppressions=$(abs_top_srcdir)/build-aux/knet_valgrind_helgrind.supp
 
 check-memcheck: $(check_PROGRAMS)
 if HAS_VALGRIND
 	export KNETMEMCHECK=yes && \
 		$(MAKE) check LOG_COMPILE="libtool --mode=execute $(MEMCHECK)"
 else
 	@echo valgrind not available on this platform
 endif
 
 check-helgrind: $(check_PROGRAMS)
 if HAS_VALGRIND
 	export KNETHELGRIND=yes && \
 		$(MAKE) check LOG_COMPILE="libtool --mode=execute $(HELGRIND)"
 else
 	@echo valgrind not available on this platform
 endif