diff --git a/lib/nbt/Tag.dart b/lib/nbt/Tag.dart
index 26fd57c..d0b3748 100644
--- a/lib/nbt/Tag.dart
+++ b/lib/nbt/Tag.dart
@@ -227,7 +227,7 @@ abstract class Tag {
     if (getKey() == "") {
       return false;
     } else {
-      String letters = "abcdefghijklmnopqrstuvwxyz";
+      String letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
       for (int i = 0; i < getKey().length; i++) {
         String digit = getKey().substring(i, i + 1);
         if (letters.indexOf(digit) == -1) {
@@ -238,6 +238,21 @@ abstract class Tag {
     }
   }
 
+  bool shouldQuote(String value) {
+    if (value == "") {
+      return false;
+    } else {
+      String letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
+      for (int i = 0; i < value.length; i++) {
+        String digit = value.substring(i, i + 1);
+        if (letters.indexOf(digit) == -1) {
+          return true;
+        }
+      }
+      return false;
+    }
+  }
+
   void writeStringifiedValue(StringBuilder builder, int indent, bool isList);
   void readStringifiedValue(StringReader reader);
 
diff --git a/lib/nbt/impl/StringTag.dart b/lib/nbt/impl/StringTag.dart
index 2978e2c..6876fe7 100644
--- a/lib/nbt/impl/StringTag.dart
+++ b/lib/nbt/impl/StringTag.dart
@@ -36,7 +36,10 @@ class StringTag extends Tag {
 
   @override
   void writeStringifiedValue(StringBuilder builder, int indent, bool isList) {
-    builder.append("${isList ? "".padLeft(indent, '\t') : ""}\"${value}\"");
+    if (shouldQuote(value))
+      builder.append("${isList ? "".padLeft(indent, '\t') : ""}\"${value}\"");
+    else
+      builder.append("${isList ? "".padLeft(indent, '\t') : ""}${value}");
   }
 
   @override
diff --git a/pubspec.yaml b/pubspec.yaml
index 7488d5f..8339ee0 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: libac_dart
 description: "Aria's Creations code library"
-version: 1.0.35
+version: 1.0.36
 homepage: "https://zontreck.com"