diff --git a/.changeset/loud-sheep-press.md b/.changeset/loud-sheep-press.md
new file mode 100644
index 000000000..06959a230
--- /dev/null
+++ b/.changeset/loud-sheep-press.md
@@ -0,0 +1,5 @@
+---
+"@telegram-apps/sdk": patch
+---
+
+Fix invalid Mini App mount using theme params RGB header color
diff --git a/packages/sdk/src/scopes/components/mini-app/methods.ts b/packages/sdk/src/scopes/components/mini-app/methods.ts
index b1eeaa3f9..281368356 100644
--- a/packages/sdk/src/scopes/components/mini-app/methods.ts
+++ b/packages/sdk/src/scopes/components/mini-app/methods.ts
@@ -18,9 +18,6 @@ import { computed, type Computed } from '@telegram-apps/signals';
 import { $version, postEvent } from '@/scopes/globals.js';
 import { ERR_ALREADY_CALLED } from '@/errors.js';
 import { mount as tpMount } from '@/scopes/components/theme-params/methods.js';
-import {
-  headerBackgroundColor as tpHeaderBackgroundColor,
-} from '@/scopes/components/theme-params/signals.js';
 import { subAndCall } from '@/utils/subAndCall.js';
 import { withSupports } from '@/scopes/toolkit/withSupports.js';
 import { withIsSupported } from '@/scopes/toolkit/withIsSupported.js';
@@ -139,7 +136,7 @@ export const mount = withComponentSupported((): void => {
 
     backgroundColor.set(s ? s.backgroundColor : 'bg_color');
     bottomBarColor.set(s ? s.bottomBarColor : 'bottom_bar_bg_color');
-    headerColor.set(s ? s.headerColor : tpHeaderBackgroundColor() || 'bg_color');
+    headerColor.set(s ? s.headerColor : 'bg_color');
 
     setBackgroundColor.isSupported() && subAndCall(backgroundColor, onBgColorChanged);
     setBottomBarColor.isSupported() && subAndCall(bottomBarColor, onBottomBarBgColorChanged);