diff --git a/Libraries/LibWeb/CSS/StyleValues/StringStyleValue.h b/Libraries/LibWeb/CSS/StyleValues/StringStyleValue.h
index b0526b249bd..2141717455f 100644
--- a/Libraries/LibWeb/CSS/StyleValues/StringStyleValue.h
+++ b/Libraries/LibWeb/CSS/StyleValues/StringStyleValue.h
@@ -8,6 +8,7 @@
 
 #include <AK/FlyString.h>
 #include <LibWeb/CSS/CSSStyleValue.h>
+#include <LibWeb/CSS/Serialize.h>
 
 namespace Web::CSS {