diff --git a/leap-upgrades/lib/functions.sh b/leap-upgrades/lib/functions.sh
index d4e07eb3..568b0e80 100644
--- a/leap-upgrades/lib/functions.sh
+++ b/leap-upgrades/lib/functions.sh
@@ -418,7 +418,7 @@ function build_venv {
 
     # Install libmysqlclient-dev so that we are later able to build mysql-python
     # Allow libmariadbclient-dev to be used instead
-    if ! apt --installed list | grep libmariadbclient; then
+    if apt --installed list | grep libmariadbclient; then
       apt-get -y install libmariadbclient-dev > /dev/null
     else
       apt-get -y install libmysqlclient-dev > /dev/null