diff --git a/AK/FlyString.cpp b/AK/FlyString.cpp
index a475ea39999..f8089be5701 100644
--- a/AK/FlyString.cpp
+++ b/AK/FlyString.cpp
@@ -53,6 +53,12 @@ FlyString::FlyString(String const& string)
     String::ref_fly_string_data({}, m_data);
 }
 
+FlyString& FlyString::operator=(String const& string)
+{
+    *this = FlyString { string };
+    return *this;
+}
+
 FlyString::FlyString(FlyString const& other)
     : m_data(other.m_data)
 {
diff --git a/AK/FlyString.h b/AK/FlyString.h
index 1052c64ba42..933af662a59 100644
--- a/AK/FlyString.h
+++ b/AK/FlyString.h
@@ -22,6 +22,7 @@ public:
 
     static ErrorOr<FlyString> from_utf8(StringView);
     explicit FlyString(String const&);
+    FlyString& operator=(String const&);
 
     FlyString(FlyString const&);
     FlyString& operator=(FlyString const&);