diff --git a/.changeset/serious-jeans-tap.md b/.changeset/serious-jeans-tap.md
new file mode 100644
index 00000000..3e8825bf
--- /dev/null
+++ b/.changeset/serious-jeans-tap.md
@@ -0,0 +1,5 @@
+---
+'@xyflow/system': patch
+---
+
+Add separators to horizontal control buttons
diff --git a/packages/system/src/styles/style.css b/packages/system/src/styles/style.css
index cb6f2b7c..a6e5f9da 100644
--- a/packages/system/src/styles/style.css
+++ b/packages/system/src/styles/style.css
@@ -158,4 +158,17 @@
   &-button:last-child {
     border-bottom: none;
   }
+
+  &.horizontal &-button {
+    border-bottom: none;
+    border-right: 1px solid
+      var(
+        --xy-controls-button-border-color-props,
+        var(--xy-controls-button-border-color, var(--xy-controls-button-border-color-default))
+      );
+  }
+
+  &.horizontal &-button:last-child {
+    border-right: none;
+  }
 }