diff --git a/cmds/wifi_files.c b/cmds/wifi_files.c
index 31f9d4a..eff4755 100644
--- a/cmds/wifi_files.c
+++ b/cmds/wifi_files.c
@@ -887,12 +887,21 @@
   int i;
 
   for (i = 0; i < len; i++) {
-    if (isprint(data[i]) && data[i] != ' ' && data[i] != '\\')
-      fprintf(f, "%c", data[i]);
-    else if (data[i] == ' ' && (i != 0 && i != len -1))
-      fprintf(f, " ");
-    else
-      fprintf(f, "\\x%.2x", data[i]);
+    switch(data[i]) {
+      case '\\': fprintf(f, "\\\\"); break;
+      case '"': fprintf(f, "\\\""); break;
+      case '\b': fprintf(f, "\\b"); break;
+      case '\f': fprintf(f, "\\f"); break;
+      case '\n': fprintf(f, "\\n"); break;
+      case '\r': fprintf(f, "\\r"); break;
+      case '\t': fprintf(f, "\\t"); break;
+      default:
+        if ((data[i] <= 0x1f) || !isprint(data[i])) {
+          fprintf(f, "\\u00%02x", data[i]);
+        } else {
+          fprintf(f, "%c", data[i]); break;
+        }
+    }
   }
 }
 
diff --git a/cmds/wifi_files_test.c b/cmds/wifi_files_test.c
index bb0043c..9d48dd1 100644
--- a/cmds/wifi_files_test.c
+++ b/cmds/wifi_files_test.c
@@ -34,8 +34,8 @@
 {
   FILE *f = tmpfile();
   char buf[32];
-  const uint8_t ssid[] = {'a', 'b', 0x86, ' ', 'c'};  /* not NUL terminated. */
-  const uint8_t expected[] = {'a', 'b', '\\', 'x', '8', '6', ' ', 'c'};
+  const uint8_t ssid[] = {'b', 0x86, ' ', 'c'};  /* not NUL terminated. */
+  const uint8_t expected[] = {'b', '\\', 'u', '0', '0', '8', '6', ' ', 'c'};
 
   printf("Testing \"%s\" in %s:\n", __FUNCTION__, __FILE__);
   memset(buf, 0, sizeof(buf));