diff --git a/binding_generator.py b/binding_generator.py
index 380033d7..fd994bf8 100644
--- a/binding_generator.py
+++ b/binding_generator.py
@@ -570,22 +570,26 @@ def generate_builtin_class_header(builtin_api, size, used_classes, fully_used_cl
 
     # Special cases.
     if class_name == "String":
-        result.append("String &operator=(const char *p_str);")
-        result.append("String &operator=(const wchar_t *p_str);")
-        result.append("String &operator=(const char16_t *p_str);")
-        result.append("String &operator=(const char32_t *p_str);")
-        result.append("bool operator==(const char *p_str) const;")
-        result.append("bool operator==(const wchar_t *p_str) const;")
-        result.append("bool operator==(const char16_t *p_str) const;")
-        result.append("bool operator==(const char32_t *p_str) const;")
-        result.append("bool operator!=(const char *p_str) const;")
-        result.append("bool operator!=(const wchar_t *p_str) const;")
-        result.append("bool operator!=(const char16_t *p_str) const;")
-        result.append("bool operator!=(const char32_t *p_str) const;")
-        result.append(f"\tconst char32_t &operator[](int p_index) const;")
-        result.append(f"\tchar32_t &operator[](int p_index);")
-        result.append(f"\tconst char32_t *ptr() const;")
-        result.append(f"\tchar32_t *ptrw();")
+        result.append("\tString &operator=(const char *p_str);")
+        result.append("\tString &operator=(const wchar_t *p_str);")
+        result.append("\tString &operator=(const char16_t *p_str);")
+        result.append("\tString &operator=(const char32_t *p_str);")
+        result.append("\tbool operator==(const char *p_str) const;")
+        result.append("\tbool operator==(const wchar_t *p_str) const;")
+        result.append("\tbool operator==(const char16_t *p_str) const;")
+        result.append("\tbool operator==(const char32_t *p_str) const;")
+        result.append("\tbool operator!=(const char *p_str) const;")
+        result.append("\tbool operator!=(const wchar_t *p_str) const;")
+        result.append("\tbool operator!=(const char16_t *p_str) const;")
+        result.append("\tbool operator!=(const char32_t *p_str) const;")
+        result.append("\tString operator+(const char *p_chr);")
+        result.append("\tString operator+(const wchar_t *p_chr);")
+        result.append("\tString operator+(const char16_t *p_chr);")
+        result.append("\tString operator+(const char32_t *p_chr);")
+        result.append("\tconst char32_t &operator[](int p_index) const;")
+        result.append("\tchar32_t &operator[](int p_index);")
+        result.append("\tconst char32_t *ptr() const;")
+        result.append("\tchar32_t *ptrw();")
 
     if class_name == "Array":
         result.append("\ttemplate <class... Args>")
diff --git a/src/variant/char_string.cpp b/src/variant/char_string.cpp
index cc217401..33e10dbf 100644
--- a/src/variant/char_string.cpp
+++ b/src/variant/char_string.cpp
@@ -327,6 +327,22 @@ bool String::operator!=(const char32_t *p_str) const {
 	return *this != String(p_str);
 }
 
+String String::operator+(const char *p_chr) {
+	return *this + String(p_chr);
+}
+
+String String::operator+(const wchar_t *p_chr) {
+	return *this + String(p_chr);
+}
+
+String String::operator+(const char16_t *p_chr) {
+	return *this + String(p_chr);
+}
+
+String String::operator+(const char32_t *p_chr) {
+	return *this + String(p_chr);
+}
+
 const char32_t &String::operator[](int p_index) const {
 	return *internal::gdn_interface->string_operator_index_const((GDNativeStringPtr)this, p_index);
 }