diff --git a/ocaml-sedlex.spec b/ocaml-sedlex.spec
index b5e1b78..0786cfe 100644
--- a/ocaml-sedlex.spec
+++ b/ocaml-sedlex.spec
@@ -1,6 +1,6 @@
 Name:           ocaml-sedlex
 Version:        2.1
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Unicode-friendly lexer generator
 
 License:        MIT
@@ -48,6 +48,11 @@ rm -r $RPM_BUILD_ROOT%{_prefix}/doc/sedlex/{CHANGES,README.md,LICENSE}
 # Makes *.cmxs and *.opt executable such that they will be stripped.
 find $RPM_BUILD_ROOT -name '*.{cmxs,opt}' -exec chmod 0755 {} \;
 
+# uchar is a compatibility package for older OCaml version
+sed -i 's/uchar//g' $RPM_BUILD_ROOT%{_libdir}/ocaml/sedlex/META
+sed -i 's/uchar//g' $RPM_BUILD_ROOT%{_libdir}/ocaml/sedlex/dune-package
+sed -i 's/"uchar"//g' $RPM_BUILD_ROOT%{_libdir}/ocaml/sedlex/opam
+
 %files
 %doc README.md CHANGES
 %license LICENSE
@@ -70,6 +75,9 @@ find $RPM_BUILD_ROOT -name '*.{cmxs,opt}' -exec chmod 0755 {} \;
 
 
 %changelog
+* Fri Nov 08 2019 Andy Li <andy@onthewings.net> - 2.1-2
+- Remove dependency on uchar.
+
 * Wed Oct 30 2019 Andy Li <andy@onthewings.net> - 2.1-1
 - New upstream version.
 - Update URL.