diff --git a/packages/styles/scss/components/modal/_modal.scss b/packages/styles/scss/components/modal/_modal.scss
index 7525b6542cff..d505dad714c3 100644
--- a/packages/styles/scss/components/modal/_modal.scss
+++ b/packages/styles/scss/components/modal/_modal.scss
@@ -125,7 +125,7 @@
 
   // fluid form in modal
   .#{$prefix}--modal-content .#{$prefix}--form--fluid {
-    margin-inline: -$spacing-05 -$spacing-05;
+    margin-inline: -$spacing-05 - $spacing-05;
   }
 
   //TO-DO: remove .#{$prefix}--modal-content__regular-content in v11 since hasForm has been deprecated