diff --git a/scripts/build/installer_debian-installer b/scripts/build/installer_debian-installer
index e9843d672..a0a3f5f1a 100755
--- a/scripts/build/installer_debian-installer
+++ b/scripts/build/installer_debian-installer
@@ -528,7 +528,7 @@ then
 	fi
 
 	# Sorting udebs
-	if [ "${LB_DERIVATIVE}" = true ]
+	if [ "${LB_DERIVATIVE}" = "true" ]
 	then
 		UDEBS="$(awk '/Filename: / { print $2 }' Packages.derivative)"
 	fi