diff --git a/Libraries/LibHTML/CSS/StyleResolver.cpp b/Libraries/LibHTML/CSS/StyleResolver.cpp
index 76c4a34ae0..9377943ca5 100644
--- a/Libraries/LibHTML/CSS/StyleResolver.cpp
+++ b/Libraries/LibHTML/CSS/StyleResolver.cpp
@@ -22,7 +22,7 @@ static StyleSheet& default_stylesheet()
     if (!sheet) {
         extern const char default_stylesheet_source[];
         String css = default_stylesheet_source;
-        sheet = &parse_css(css).leak_ref();
+        sheet = parse_css(css).leak_ref();
     }
     return *sheet;
 }
diff --git a/Libraries/LibHTML/Parser/CSSParser.cpp b/Libraries/LibHTML/Parser/CSSParser.cpp
index 5ce42df1cb..5c562389bb 100644
--- a/Libraries/LibHTML/Parser/CSSParser.cpp
+++ b/Libraries/LibHTML/Parser/CSSParser.cpp
@@ -376,7 +376,7 @@ public:
         consume_whitespace_or_comments();
     }
 
-    NonnullRefPtr<StyleSheet> parse_sheet()
+    RefPtr<StyleSheet> parse_sheet()
     {
         while (index < css.length()) {
             parse_rule();
@@ -385,7 +385,7 @@ public:
         return StyleSheet::create(move(rules));
     }
 
-    NonnullRefPtr<StyleDeclaration> parse_standalone_declaration()
+    RefPtr<StyleDeclaration> parse_standalone_declaration()
     {
         consume_whitespace_or_comments();
         for (;;) {
@@ -415,13 +415,13 @@ private:
     StringView css;
 };
 
-NonnullRefPtr<StyleSheet> parse_css(const StringView& css)
+RefPtr<StyleSheet> parse_css(const StringView& css)
 {
     CSSParser parser(css);
     return parser.parse_sheet();
 }
 
-NonnullRefPtr<StyleDeclaration> parse_css_declaration(const StringView& css)
+RefPtr<StyleDeclaration> parse_css_declaration(const StringView& css)
 {
     CSSParser parser(css);
     return parser.parse_standalone_declaration();
diff --git a/Libraries/LibHTML/Parser/CSSParser.h b/Libraries/LibHTML/Parser/CSSParser.h
index 44e57f5dd5..050b0dd8c7 100644
--- a/Libraries/LibHTML/Parser/CSSParser.h
+++ b/Libraries/LibHTML/Parser/CSSParser.h
@@ -3,6 +3,6 @@
 #include <AK/NonnullRefPtr.h>
 #include <LibHTML/CSS/StyleSheet.h>
 
-NonnullRefPtr<StyleSheet> parse_css(const StringView&);
-NonnullRefPtr<StyleDeclaration> parse_css_declaration(const StringView&);
+RefPtr<StyleSheet> parse_css(const StringView&);
+RefPtr<StyleDeclaration> parse_css_declaration(const StringView&);