diff --git a/src/Makevars b/src/Makevars
index 88f934b..396565a 100644
--- a/src/Makevars
+++ b/src/Makevars
@@ -4,6 +4,8 @@
 PKG_CPPFLAGS = -Iprotozero/include -Ilibosmium/include
 # PKG_LIBS = protozero/libprotozero.a libsomium/libosmium.a 
 
+PKG_LIBS = -lexpat
+
 $(SHLIB): protozero libosmium
 
 protozero:
diff --git a/src/Makevars.win b/src/Makevars.win
index 2a7b705..500c70e 100644
--- a/src/Makevars.win
+++ b/src/Makevars.win
@@ -4,6 +4,8 @@
 PKG_CPPFLAGS = -Iprotozero/include -Ilibosmium/include
 # PKG_LIBS = protozero/libprotozero.a libsomium/libosmium.a 
 
+PKG_LIBS = -lexpat
+
 $(SHLIB): protozero libosmium
 
 protozero: