diff --git a/Makefile b/Makefile
index 380f61d..af1e86a 100644
--- a/Makefile
+++ b/Makefile
@@ -40,7 +40,7 @@ CXXFLAGS	:= $(CFLAGS)
 ASFLAGS	:=	-g $(ARCH)
 LDFLAGS	=	-g $(ARCH) $(RPXSPECS) -Wl,-Map,$(notdir $*.map) $(WUPSSPECS)
 
-LIBS	:= -lwups -lwut
+LIBS	:= -lwups -lwut -lz
 
 #-------------------------------------------------------------------------------
 # list of directories containing libraries, this must be the top level