diff --git a/Makefile b/Makefile
index 4878ffbba7b4756b52735dc14ba8c1de31d963f8..d6a1fb58dcc368ecd6591eef6377431ce7782e27 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ USRLDFLAGS = -L${LIB_NEWMAT} -L${LIB_PROB}
 
 OBJS = slicetimer.o
 
-LIBS = -lnewimage -lmiscmaths -lavwio -lnewmat -lprob -lm -lutils
+LIBS = -lnewimage -lmiscmaths -lavwio -lnewmat -lprob -lm -lutils -lz
 
 XFILES = slicetimer