diff --git a/tools/Makefile.am b/tools/Makefile.am
index 8c4b1ce..a9dd8b9 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -33,8 +33,9 @@ gf_inline_time_SOURCES = gf_inline_time.c
 #gf_inline_time_LDFLAGS = -lgf_complete
 gf_inline_time_LDADD = ../src/libgf_complete.la
 
+# gf_unit 8 A -1 -m LOG_ZERO_EXT is excluded until http://lab.jerasure.org/jerasure/gf-complete/issues/13 is resolved
 if ENABLE_VALGRIND
-VALGRIND = | sed -e 's|^|../libtool --mode=execute valgrind --quiet --error-exitcode=1 --tool=memcheck |'
+VALGRIND = | perl -p -e 's|^|../libtool --mode=execute valgrind --quiet --error-exitcode=1 --tool=memcheck | if(!/gf_unit 8 A -1 -m LOG_ZERO_EXT/)'
 endif
 
 # gf_unit tests as generated by gf_methods