diff --git a/loaih/__init__.py b/loaih/__init__.py
index ecd087c..5c6398e 100644
--- a/loaih/__init__.py
+++ b/loaih/__init__.py
@@ -168,7 +168,7 @@ class Build(object):
         subprocess.run("find .. -iname '*.deb' -exec dpkg -x {} . \;", shell=True, cwd=self.appimagedir)
         if self.portable:
             shortversion = str.join('.', self.version.split('.')[:3])
-            subprocess.run("find . -type f -iname 'bootstraprc' -exec sed -i 's|^UserInstallation=.*|UserInstallation=\$SYSUSERCONFIG/libreoffice/{version}|g' {} \+".format(version = shortversion), shell=True, cwd=self.appimagedir)
+            subprocess.run("find . -type f -iname 'bootstraprc' -exec sed -i 's|^UserInstallation=.*|UserInstallation=\$SYSUSERCONFIG/libreoffice/%s|g' {} \+" % shortversion, shell=True, cwd=self.appimagedir)
 
         # Changing desktop file
         subprocess.run("find . -iname startcenter.desktop -exec cp {} . \;", shell=True, cwd=self.appimagedir)