diff --git a/xpra.changes b/xpra.changes
index 5fc131e..32a1a04 100644
--- a/xpra.changes
+++ b/xpra.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Fri Feb  5 15:15:15 UTC 2021 - olaf@aepfle.de
+
+- Fix requires for /bin/bash
+
 -------------------------------------------------------------------
 Thu Dec 31 19:17:12 UTC 2020 - Luigi Baldoni <aloisio@gmx.com>
 
diff --git a/xpra.spec b/xpra.spec
index bc15e54..3cb61e3 100644
--- a/xpra.spec
+++ b/xpra.spec
@@ -115,18 +115,19 @@ connections, and also the xpra html5 client.
 
 %prep
 %autosetup -p1
+
+%build
 # fix shebangs
 find -name '*.py' \
      -exec sed -i '1{\@^#!/usr/bin/env python@d}' {} +
 sed -i "1 s|^#!/usr/bin/env python\b|#!%__python3|" cups/xpraforwarder
-sed -i "1 s|^/usr/bin/bash|#!$(which bash)|" scripts/xpra_udev_product_version
+sed -i "1 s|^/usr/bin/bash|#!/bin/bash|" scripts/xpra_udev_product_version
 install -m0644 %{SOURCE1} -t xdg
 # set fillup dir
 sed -e 's|__FILLUPDIR__|%{_fillupdir}|' \
     -e 's|__UNITDIR__|%{_unitdir}|' \
     -i setup.py
 
-%build
 python3 setup.py build \
     --verbose \
     --with-enc_ffmpeg \