diff --git a/cfg.h b/cfg.h
index da0fb18..eda5be5 100644
--- a/cfg.h
+++ b/cfg.h
@@ -99,6 +99,28 @@ bool string_compare(string* a, string* b) {
   return strncmp(a->str, b->str, a->len) == 0;
 }
 
+ssize_t string_count_char(string* s, char c) {
+  int i;
+  ssize_t res = 0;
+  for (i = 0; i < s->len; i++) if (s->str[i] == c) res++;
+  return res;
+}
+
+string string_quote(string* replace) {
+  int i = 0;
+  ssize_t quotes = string_count_char(replace, '"');
+  string res = new_string_sized(replace->len+quotes);
+  res.len = res.cap;
+
+  quotes = 0;
+  for (i = 0; i < replace->len; i++) {
+    if (replace->str[i] == '"') res.str[i+(quotes++)] = '\\';
+    res.str[i+quotes] = replace->str[i];
+  }
+
+  return res;
+}
+
 // FNV-1a
 size_t string_hash(string* s) {
   size_t hash = 2166136261;
@@ -348,7 +370,8 @@ string config_value_str(config_value* c, unsigned int indent) {
       return res;
     case config_value_string:
       string_cappend(&res, "\"");
-      string_append(&res, &c->s);
+      sub = string_quote(&c->s);
+      string_append(&res, &sub);
       string_cappend(&res, "\"");
       break;
     case config_value_number:
diff --git a/examples/nested_simple.c b/examples/nested_simple.c
index f0a586e..80ea3a9 100644
--- a/examples/nested_simple.c
+++ b/examples/nested_simple.c
@@ -13,7 +13,7 @@ int main() {
   config_add_list(&c, string_from_cstr("mylist"), &l);
   config sub = new_config();
   config_add_number(&sub, string_from_cstr("mysecondnum"), 23);
-  config_add_string(&sub, string_from_cstr("mysecondstring"), string_from_cstr("inner"));
+  config_add_string(&sub, string_from_cstr("mysecondstring"), string_from_cstr("\"inner\"\"quoted\""));
   config_add_section(&c, string_from_cstr("mysection"), &sub);
 
   string s = config_str(&c, 0);