diff --git a/apps/theming/lib/Themes/CommonThemeTrait.php b/apps/theming/lib/Themes/CommonThemeTrait.php
index ef5ce2c4c7848..42ee6212cee84 100644
--- a/apps/theming/lib/Themes/CommonThemeTrait.php
+++ b/apps/theming/lib/Themes/CommonThemeTrait.php
@@ -54,8 +54,8 @@ protected function generatePrimaryVariables(string $colorMainBackground, string
 			// ⚠️ Using 'no' as a value to make sure we specify an
 			// invalid one with no fallback. 'unset' could here fallback to some
 			// other theme with media queries
-			'--primary-invert-if-bright' => $this->util->invertTextColor($this->primaryColor) ? 'invert(100%)' : 'no',
-			'--primary-invert-if-dark' => $this->util->invertTextColor($this->primaryColor) ? 'no' : 'invert(100%)',
+			'--primary-invert-if-bright' => $this->util->invertTextColor($colorPrimaryElement) ? 'invert(100%)' : 'no',
+			'--primary-invert-if-dark' => $this->util->invertTextColor($colorPrimaryElement) ? 'no' : 'invert(100%)',
 
 			'--color-primary' => $this->primaryColor,
 			'--color-primary-default' => $this->defaultPrimaryColor,