diff --git a/src/ZeekString.cc b/src/ZeekString.cc
index 6d2e39ac31..e5bfaacd5c 100644
--- a/src/ZeekString.cc
+++ b/src/ZeekString.cc
@@ -37,6 +37,12 @@ String::String(bool arg_final_NUL, byte_vec str, int arg_n) {
     use_free_to_delete = false;
 }
 
+String::String(String&& other) noexcept
+    : b(other.b), n(other.n), final_NUL(other.final_NUL), use_free_to_delete(other.use_free_to_delete) {
+    other.b = nullptr;
+    other.Reset();
+}
+
 String::String(const u_char* str, int arg_n, bool add_NUL) : String() { Set(str, arg_n, add_NUL); }
 
 String::String(std::string_view str) : String() { Set(str); }
diff --git a/src/ZeekString.h b/src/ZeekString.h
index 44fee2d8cd..433e318868 100644
--- a/src/ZeekString.h
+++ b/src/ZeekString.h
@@ -47,6 +47,9 @@ public:
     // Constructor that takes ownership of the vector passed in.
     String(bool arg_final_NUL, byte_vec str, int arg_n);
 
+    // Move constructor
+    String(String&& s) noexcept;
+
     String();
     ~String() { Reset(); }