diff --git a/.changeset/red-pens-punch.md b/.changeset/red-pens-punch.md
new file mode 100644
index 000000000..47aa4db78
--- /dev/null
+++ b/.changeset/red-pens-punch.md
@@ -0,0 +1,5 @@
+---
+"@tabler/core": patch
+---
+
+Fix negative margins in `.navbar-bordered` variant
diff --git a/core/scss/ui/_nav.scss b/core/scss/ui/_nav.scss
index 98120fcb0..76421a68b 100644
--- a/core/scss/ui/_nav.scss
+++ b/core/scss/ui/_nav.scss
@@ -36,7 +36,7 @@
   .nav-link {
     padding-left: 0;
     padding-right: 0;
-    margin: 0 0 (- $nav-bordered-border-width);
+    margin: 0 0 calc(-1 * #{$nav-bordered-border-width});
     border: 0;
     border-bottom: $nav-bordered-link-active-border-width var(--#{$prefix}border-style) transparent;
   }
@@ -88,4 +88,4 @@
       justify-content: center;
     }
   }
-}
\ No newline at end of file
+}