diff --git a/addons/portal/static/src/scss/bootstrap_overridden.scss b/addons/portal/static/src/scss/bootstrap_overridden.scss
index 2fc73b519ae..fde568aa242 100644
--- a/addons/portal/static/src/scss/bootstrap_overridden.scss
+++ b/addons/portal/static/src/scss/bootstrap_overridden.scss
@@ -15,3 +15,8 @@ $font-size-sm: (12 / 16) * 1rem;
 
 $btn-padding-y-sm: (1 / 16) * 1rem;
 $btn-padding-x-sm: (5 / 16) * 1rem;
+
+// Modals
+
+$modal-lg: $o-modal-lg;
+$modal-md: $o-modal-md;
diff --git a/addons/web/static/src/scss/bootstrap_overridden.scss b/addons/web/static/src/scss/bootstrap_overridden.scss
index 09dd5ddbfd4..e8406c948e9 100644
--- a/addons/web/static/src/scss/bootstrap_overridden.scss
+++ b/addons/web/static/src/scss/bootstrap_overridden.scss
@@ -133,8 +133,8 @@ $modal-inner-padding: $o-horizontal-padding;
 
 // FIXME $modal-title-padding ?
 
-$modal-lg: 980px;
-$modal-md: 650px;
+$modal-lg: $o-modal-lg;
+$modal-md: $o-modal-md;
 
 // Breadcrumbs
 
diff --git a/addons/web/static/src/scss/primary_variables.scss b/addons/web/static/src/scss/primary_variables.scss
index e3b520e47f1..02835171794 100644
--- a/addons/web/static/src/scss/primary_variables.scss
+++ b/addons/web/static/src/scss/primary_variables.scss
@@ -65,6 +65,9 @@ $o-sheet-vpadding: 24px;
 $o-notification-error-bg-color: #F16567;
 $o-notification-info-bg-color: #FCFBEA;
 
+$o-modal-lg: 980px;
+$o-modal-md: 650px;
+
 // Needed for having no spacing between sheet and mail body in mass_mailing:
 // Different required cancel paddings between web and web_enterprise
 $o-sheet-cancel-tpadding: 0px;