diff --git a/PyYAML.spec b/PyYAML.spec
index 135e39d..c63cd6e 100644
--- a/PyYAML.spec
+++ b/PyYAML.spec
@@ -1,11 +1,12 @@
 Name:           PyYAML
 Version:        4.2
 Release:        0.1.b4%{?dist}
+%global uversion %{version}b4
 Summary:        YAML parser and emitter for Python
 
 License:        MIT
 URL:            https://github.com/yaml/pyyaml
-Source0:        https://github.com/yaml/pyyaml/archive/%{name}-%{version}.tar.gz
+Source0:        https://github.com/yaml/pyyaml/archive/%{name}-%{uversion}.tar.gz
 
 BuildRequires:  gcc
 BuildRequires:  libyaml-devel
@@ -64,7 +65,7 @@ Obsoletes:      python3-PyYAML < 4.1-5
 
 
 %prep
-%setup -q -n %{name}-%{version}
+%setup -q -n %{name}-%{uversion}
 chmod a-x examples/yaml-highlight/yaml_hl.py
 
 # remove pre-generated file