Index: src/wp-content/themes/twentyseventeen/inc/custom-header.php
===================================================================
--- src/wp-content/themes/twentyseventeen/inc/custom-header.php	(revision 39370)
+++ src/wp-content/themes/twentyseventeen/inc/custom-header.php	(working copy)
@@ -84,9 +84,17 @@
 		else :
 	?>
 		.site-title a,
-		 body.has-header-image .site-title a,
+		.colors-dark .site-title a,
+		.colors-custom .site-title a,
+		body.has-header-image .site-title a,
+		body.has-header-image.colors-dark .site-title a,
+		body.has-header-image.colors-custom .site-title a,
 		.site-description,
-		body.has-header-image .site-description {
+		.colors-dark .site-description,
+		.colors-custom .site-description,
+		body.has-header-image .site-description,
+		body.has-header-image.colors-dark .site-description,
+		body.has-header-image.colors-custom .site-description {
 			color: #<?php echo esc_attr( $header_text_color ); ?>;
 		}
 	<?php endif; ?>