diff --git a/scripts/Modules.build b/scripts/Modules.build
index ff56298..8650076 100755
--- a/scripts/Modules.build
+++ b/scripts/Modules.build
@@ -8,7 +8,7 @@ TCL_DIR="${PSI_PREFIX}/Programming/Tcl/${TCL_VERSION}"
 PATH="${TCL_DIR}/bin:${PATH}"
 
 function em.configure() {
-	CPPFLAGS="-DUSE_INTERP_ERRORLINE" "${MODULE_SRCDIR}"/configure \
+	CPPFLAGS="-DUSE_INTERP_ERRORLINE" LIBS="-lz -lpthread" "${MODULE_SRCDIR}"/configure \
 		--prefix="${PSI_PREFIX}/${MODULE_FAMILY}" \
 		--with-module-path="${PSI_PREFIX}/${PSI_MODULES_ROOT}" \
 		--with-tcl="${TCL_DIR}/lib" \