diff --git a/Scalar.Installer.Mac/scripts/Distribution.xml b/Scalar.Installer.Mac/scripts/Distribution.xml
index bdbd8dce5b..235df0b759 100644
--- a/Scalar.Installer.Mac/scripts/Distribution.xml
+++ b/Scalar.Installer.Mac/scripts/Distribution.xml
@@ -19,7 +19,7 @@
GIT_PKG_REF_PLACEHOLDER
diff --git a/Scalar.Installer.Mac/scripts/preinstall b/Scalar.Installer.Mac/scripts/preinstall
index a9bf588e2f..926d22c6be 100755
--- a/Scalar.Installer.Mac/scripts/preinstall
+++ b/Scalar.Installer.Mac/scripts/preinstall
@@ -1 +1,8 @@
#!/bin/bash
+
+SCALARBINPATH="/usr/local/scalar/scalar"
+if [ -f "${SCALARBINPATH}" ]; then
+ unmountCmd="${SCALARBINPATH} service --unmount-all"
+ echo $unmountCmd
+ eval $unmountCmd || exit 1
+fi