diff --git a/src/highlighting.c b/src/highlighting.c
index 0154565a..8acdfa45 100644
--- a/src/highlighting.c
+++ b/src/highlighting.c
@@ -391,7 +391,7 @@ static void get_keyfile_ints(GKeyFile *config, GKeyFile *configh, const gchar *s
 static guint invert(guint icolour)
 {
 	if (interface_prefs.highlighting_invert_all)
-		return utils_invert_color(icolour);
+		return 0xffffff - icolour;
 
 	return icolour;
 }
diff --git a/src/utils.c b/src/utils.c
index 142de713..cd196cce 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -872,18 +872,6 @@ gchar *utils_get_hex_from_color(GdkColor *color)
 }
 
 
-guint utils_invert_color(guint color)
-{
-	guint r, g, b;
-
-	r = 0xffffff - color;
-	g = 0xffffff - (color >> 8);
-	b = 0xffffff - (color >> 16);
-
-	return (r | (g << 8) | (b << 16));
-}
-
-
 /* Get directory from current file in the notebook.
  * Returns dir string that should be freed or NULL, depending on whether current file is valid.
  * Returned string is in UTF-8 encoding */
diff --git a/src/utils.h b/src/utils.h
index 09364a47..1ea09ed3 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -209,8 +209,6 @@ gchar *utils_get_setting_string(GKeyFile *config, const gchar *section, const gc
 
 gchar *utils_get_hex_from_color(GdkColor *color);
 
-guint utils_invert_color(guint color);
-
 const gchar *utils_get_default_dir_utf8(void);
 
 gchar *utils_get_current_file_dir_utf8(void);