diff --git a/met/src/tools/other/plot_point_obs/Makefile.am b/met/src/tools/other/plot_point_obs/Makefile.am
index fffb055719..690bb9ab63 100644
--- a/met/src/tools/other/plot_point_obs/Makefile.am
+++ b/met/src/tools/other/plot_point_obs/Makefile.am
@@ -44,7 +44,7 @@ plot_point_obs_LDADD = -lvx_statistics \
 	-lvx_cal \
 	-lvx_log \
 	$(PYTHON_LIBS) \
-	-lm -lnetcdf_c++4 -lnetcdf -lgsl -lgslcblas
+	-lm -lz -lnetcdf_c++4 -lnetcdf -lgsl -lgslcblas
 EXTRA_DIST = plot_point_obs.h \
 	plot_point_obs_conf_info.h