diff --git a/.changeset/violet-ears-punch.md b/.changeset/violet-ears-punch.md
new file mode 100644
index 0000000000..a8470d5084
--- /dev/null
+++ b/.changeset/violet-ears-punch.md
@@ -0,0 +1,5 @@
+---
+'@swisspost/design-system-styles': patch
+---
+
+Added missing spinner size class.
diff --git a/packages/styles/src/variables/components/_spinners.scss b/packages/styles/src/variables/components/_spinners.scss
index 7567fa52a8..92375a50ab 100644
--- a/packages/styles/src/variables/components/_spinners.scss
+++ b/packages/styles/src/variables/components/_spinners.scss
@@ -16,6 +16,7 @@ $spinner-duration: 3.125s !default;
 $spinner-speed-reduced-motion: math.div(1, 8) !default;
 
 $spinner-size-map: (
+  12: type.$font-size-12,
   16: type.$font-size-16,
   24: type.$font-size-24,
   32: type.$font-size-32,