diff --git a/.changeset/short-trainers-dance.md b/.changeset/short-trainers-dance.md
new file mode 100644
index 000000000..d1615b109
--- /dev/null
+++ b/.changeset/short-trainers-dance.md
@@ -0,0 +1,5 @@
+---
+"@nextui-org/theme": patch
+---
+
+Fix custom slot styling with twMerge set to true (#2153)
diff --git a/packages/components/progress/stories/progress.stories.tsx b/packages/components/progress/stories/progress.stories.tsx
index bddefb8d5..789add8b7 100644
--- a/packages/components/progress/stories/progress.stories.tsx
+++ b/packages/components/progress/stories/progress.stories.tsx
@@ -122,3 +122,15 @@ export const Striped = {
     isStriped: true,
   },
 };
+
+export const CustomSlots = {
+  render: Template,
+
+  args: {
+    ...defaultProps,
+    classNames: {
+      indicator: "bg-[#14708A] rounded-[4px]",
+      track: "bg-red-500 rounded-[4px]",
+    },
+  },
+};
diff --git a/packages/core/theme/src/components/progress.ts b/packages/core/theme/src/components/progress.ts
index e3e5e4eec..347d0cfad 100644
--- a/packages/core/theme/src/components/progress.ts
+++ b/packages/core/theme/src/components/progress.ts
@@ -133,7 +133,7 @@ const progress = tv(
     ],
   },
   {
-    twMerge: false,
+    twMerge: true,
   },
 );