diff --git a/scm-server/pom.xml b/scm-server/pom.xml
index 7f2d908206..e2005c6fbe 100644
--- a/scm-server/pom.xml
+++ b/scm-server/pom.xml
@@ -205,6 +205,7 @@
               </platform>
               <scripts>
                 <preInstall>${project.basedir}/src/main/nativepkg/create-user</preInstall>
+                <postInstall>${project.basedir}/src/main/nativepkg/clear-cache</postInstall>
               </scripts>
               <mappings>
                 <files>
diff --git a/scm-server/src/main/nativepkg/clear-cache b/scm-server/src/main/nativepkg/clear-cache
new file mode 100644
index 0000000000..01d7140357
--- /dev/null
+++ b/scm-server/src/main/nativepkg/clear-cache
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+# clear workdir after upgrade
+# https://bitbucket.org/sdorra/scm-manager/issues/923/scmmanager-installed-from-debian-package
+
+WORKDIR="/var/cache/scm/work/webapp"
+if [ -d "${WORKDIR}" ]; then
+  rm -rf "${WORKDIR}"
+fi