diff --git a/include/util/hex_checker.hpp b/include/util/hex_checker.hpp
index e896031b..9855c2de 100644
--- a/include/util/hex_checker.hpp
+++ b/include/util/hex_checker.hpp
@@ -7,4 +7,4 @@
  * and transforms them into GTK-compatible rgba() syntax.
  */
 
-std::string transform_8bit_to_hex(const std::string& file_path);
+std::pair<std::string, bool> transform_8bit_to_hex(const std::string& file_path);
diff --git a/meson.build b/meson.build
index b9df3f80..0c494eb2 100644
--- a/meson.build
+++ b/meson.build
@@ -186,7 +186,6 @@ src_files = files(
     'src/util/icon_loader.cpp',
     'src/util/regex_collection.cpp',
     'src/util/css_reload_helper.cpp',
-    'src/util/has_8bit_hex.cpp',
     'src/util/transform_8bit_to_rgba.cpp'
 )
 
diff --git a/src/util/transform_8bit_to_rgba.cpp b/src/util/transform_8bit_to_rgba.cpp
index ca95784d..dc87a88e 100644
--- a/src/util/transform_8bit_to_rgba.cpp
+++ b/src/util/transform_8bit_to_rgba.cpp
@@ -25,7 +25,7 @@ TransformResult transform_8bit_to_hex(const std::string& file_path) {
   f.read(result.data(), size);
 
   static std::regex pattern(
-      R"((\#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})))");
+      R"(\#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2}))");
   std::string final_output;
 
   auto it = std::sregex_iterator(result.begin(), result.end(), pattern);