diff --git a/bin/build-odoo b/bin/build-odoo
index e49ccc7..05a93d7 100755
--- a/bin/build-odoo
+++ b/bin/build-odoo
@@ -8,7 +8,7 @@ then
     cp -r -L /builder/links /builder/odoo-addons
     rm -rf /builder/src/addons/*
     mv /builder/odoo-addons/* /builder/src/addons
-    if [[ BUILD_RESTRICT_LANG ]]
+    if [[ ! -z $BUILD_RESTRICT_LANG ]]
     then
         find /builder/src/ -name *.po ! -name $BUILD_RESTRICT_LANG -type f -exec rm -v {} +
     fi
diff --git a/bin/build-odoo-external b/bin/build-odoo-external
index 491f910..2c5a8cb 100755
--- a/bin/build-odoo-external
+++ b/bin/build-odoo-external
@@ -9,7 +9,7 @@ then
     find . -type f -name ".*" -delete
     find . -type f -name "oca_dependencies.txt" -delete
     rm -rf */setup
-    if [[ $BUILD_RESTRICT_LANG ]]
+    if [[ ! -z $BUILD_RESTRICT_LANG ]]
     then
         find . -name *.po ! -name $BUILD_RESTRICT_LANG -type f -exec rm -v {} +
     fi