diff --git a/src/main/java/com/googlecode/protobuf/format/ProtobufFormatter.java b/src/main/java/com/googlecode/protobuf/format/ProtobufFormatter.java
index 95288f3..d70594f 100644
--- a/src/main/java/com/googlecode/protobuf/format/ProtobufFormatter.java
+++ b/src/main/java/com/googlecode/protobuf/format/ProtobufFormatter.java
@@ -88,7 +88,7 @@ public String printToString(final Message message) {
             ByteArrayOutputStream out = new ByteArrayOutputStream();
             print(message, out, defaultCharset);
             out.flush();
-            return out.toString();
+            return out.toString(defaultCharset.name());
         } catch (IOException e) {
             throw new RuntimeException("Writing to a StringBuilder threw an IOException (should never happen).",
                                        e);
@@ -103,7 +103,7 @@ public String printToString(final UnknownFieldSet fields) {
             ByteArrayOutputStream out = new ByteArrayOutputStream();
             print(fields, out, defaultCharset);
             out.flush();
-            return out.toString();
+            return out.toString(defaultCharset.name());
         } catch (IOException e) {
             throw new RuntimeException("Writing to a StringBuilder threw an IOException (should never happen).",
                                        e);