diff --git a/core/src/main/java/org/bitcoinj/core/AddressMessage.java b/core/src/main/java/org/bitcoinj/core/AddressMessage.java
index 9ef09149..a3332687 100644
--- a/core/src/main/java/org/bitcoinj/core/AddressMessage.java
+++ b/core/src/main/java/org/bitcoinj/core/AddressMessage.java
@@ -126,6 +126,6 @@ public class AddressMessage extends Message {
 
     @Override
     public String toString() {
-        return "addr: " + Utils.join(addresses);
+        return "addr: " + Utils.SPACE_JOINER.join(addresses);
     }
 }
diff --git a/core/src/main/java/org/bitcoinj/core/GetBlocksMessage.java b/core/src/main/java/org/bitcoinj/core/GetBlocksMessage.java
index f13790d8..73208062 100644
--- a/core/src/main/java/org/bitcoinj/core/GetBlocksMessage.java
+++ b/core/src/main/java/org/bitcoinj/core/GetBlocksMessage.java
@@ -70,7 +70,7 @@ public class GetBlocksMessage extends Message {
 
     @Override
     public String toString() {
-        return "getblocks: " + Utils.join(locator);
+        return "getblocks: " + Utils.SPACE_JOINER.join(locator);
     }
 
     @Override
diff --git a/core/src/main/java/org/bitcoinj/core/GetHeadersMessage.java b/core/src/main/java/org/bitcoinj/core/GetHeadersMessage.java
index 2302c5ca..ec340317 100644
--- a/core/src/main/java/org/bitcoinj/core/GetHeadersMessage.java
+++ b/core/src/main/java/org/bitcoinj/core/GetHeadersMessage.java
@@ -37,7 +37,7 @@ public class GetHeadersMessage extends GetBlocksMessage {
 
     @Override
     public String toString() {
-        return "getheaders: " + Utils.join(locator);
+        return "getheaders: " + Utils.SPACE_JOINER.join(locator);
     }
 
     /**
diff --git a/core/src/main/java/org/bitcoinj/core/Utils.java b/core/src/main/java/org/bitcoinj/core/Utils.java
index 1a44bc5f..13e9399c 100644
--- a/core/src/main/java/org/bitcoinj/core/Utils.java
+++ b/core/src/main/java/org/bitcoinj/core/Utils.java
@@ -54,7 +54,7 @@ public class Utils {
     public static final String BITCOIN_SIGNED_MESSAGE_HEADER = "Bitcoin Signed Message:\n";
     public static final byte[] BITCOIN_SIGNED_MESSAGE_HEADER_BYTES = BITCOIN_SIGNED_MESSAGE_HEADER.getBytes(Charsets.UTF_8);
 
-    private static final Joiner SPACE_JOINER = Joiner.on(" ");
+    public static final Joiner SPACE_JOINER = Joiner.on(" ");
 
     private static BlockingQueue<Boolean> mockSleepQueue;
 
@@ -411,18 +411,6 @@ public class Utils {
         return iso8601.format(dateTime);
     }
 
-    /**
-     * Returns a string containing the string representation of the given items,
-     * delimited by a single space character.
-     *
-     * @param items the items to join
-     * @param <T> the item type
-     * @return the joined space-delimited string
-     */
-    public static <T> String join(Iterable<T> items) {
-        return SPACE_JOINER.join(items);
-    }
-
     public static byte[] copyOf(byte[] in, int length) {
         byte[] out = new byte[length];
         System.arraycopy(in, 0, out, 0, Math.min(length, in.length));
diff --git a/core/src/main/java/org/bitcoinj/crypto/MnemonicCode.java b/core/src/main/java/org/bitcoinj/crypto/MnemonicCode.java
index ce6d5db3..8fc014d2 100644
--- a/core/src/main/java/org/bitcoinj/crypto/MnemonicCode.java
+++ b/core/src/main/java/org/bitcoinj/crypto/MnemonicCode.java
@@ -127,7 +127,7 @@ public class MnemonicCode {
         // used as a pseudo-random function. Desired length of the
         // derived key is 512 bits (= 64 bytes).
         //
-        String pass = Utils.join(words);
+        String pass = Utils.SPACE_JOINER.join(words);
         String salt = "mnemonic" + passphrase;
 
         final Stopwatch watch = Stopwatch.createStarted();
diff --git a/core/src/main/java/org/bitcoinj/script/Script.java b/core/src/main/java/org/bitcoinj/script/Script.java
index 6adbeeff..6abd00aa 100644
--- a/core/src/main/java/org/bitcoinj/script/Script.java
+++ b/core/src/main/java/org/bitcoinj/script/Script.java
@@ -135,7 +135,7 @@ public class Script {
      */
     @Override
     public String toString() {
-        return Utils.join(chunks);
+        return Utils.SPACE_JOINER.join(chunks);
     }
 
     /** Returns the serialized program as a newly created byte array. */
diff --git a/core/src/main/java/org/bitcoinj/wallet/DeterministicKeyChain.java b/core/src/main/java/org/bitcoinj/wallet/DeterministicKeyChain.java
index b484e5bb..11201dba 100644
--- a/core/src/main/java/org/bitcoinj/wallet/DeterministicKeyChain.java
+++ b/core/src/main/java/org/bitcoinj/wallet/DeterministicKeyChain.java
@@ -1319,7 +1319,7 @@ public class DeterministicKeyChain implements EncryptableKeyChain {
                 builder.append("Seed is encrypted\n");
             } else if (includePrivateKeys) {
                 final List<String> words = seed.getMnemonicCode();
-                builder.append("Seed as words: ").append(Utils.join(words)).append('\n');
+                builder.append("Seed as words: ").append(Utils.SPACE_JOINER.join(words)).append('\n');
                 builder.append("Seed as hex:   ").append(seed.toHexString()).append('\n');
             }
             builder.append("Seed birthday: ").append(seed.getCreationTimeSeconds()).append("  [")
diff --git a/core/src/main/java/org/bitcoinj/wallet/DeterministicSeed.java b/core/src/main/java/org/bitcoinj/wallet/DeterministicSeed.java
index b5dea84c..b0182315 100644
--- a/core/src/main/java/org/bitcoinj/wallet/DeterministicSeed.java
+++ b/core/src/main/java/org/bitcoinj/wallet/DeterministicSeed.java
@@ -134,7 +134,7 @@ public class DeterministicSeed implements EncryptableItem {
     public String toString() {
         return isEncrypted()
             ? "DeterministicSeed [encrypted]"
-            : "DeterministicSeed " + toHexString() + " " + Utils.join(mnemonicCode);
+            : "DeterministicSeed " + toHexString() + " " + Utils.SPACE_JOINER.join(mnemonicCode);
     }
 
     /** Returns the seed as hex or null if encrypted. */
@@ -188,7 +188,7 @@ public class DeterministicSeed implements EncryptableItem {
     }
 
     private byte[] getMnemonicAsBytes() {
-        return Utils.join(mnemonicCode).getBytes(Charsets.UTF_8);
+        return Utils.SPACE_JOINER.join(mnemonicCode).getBytes(Charsets.UTF_8);
     }
 
     public DeterministicSeed decrypt(KeyCrypter crypter, String passphrase, KeyParameter aesKey) {
diff --git a/core/src/test/java/org/bitcoinj/crypto/MnemonicCodeTest.java b/core/src/test/java/org/bitcoinj/crypto/MnemonicCodeTest.java
index 4757d0bf..210261c5 100644
--- a/core/src/test/java/org/bitcoinj/crypto/MnemonicCodeTest.java
+++ b/core/src/test/java/org/bitcoinj/crypto/MnemonicCodeTest.java
@@ -171,7 +171,7 @@ public class MnemonicCodeTest {
             byte[] entropy = mc.toEntropy(split(vecCode));
 
             assertEquals(vecData, HEX.encode(entropy));
-            assertEquals(vecCode, Utils.join(code));
+            assertEquals(vecCode, Utils.SPACE_JOINER.join(code));
             assertEquals(vecSeed, HEX.encode(seed));
         }
     }
diff --git a/examples/src/main/java/org/bitcoinj/examples/BackupToMnemonicSeed.java b/examples/src/main/java/org/bitcoinj/examples/BackupToMnemonicSeed.java
index bfb2e483..66e5575c 100644
--- a/examples/src/main/java/org/bitcoinj/examples/BackupToMnemonicSeed.java
+++ b/examples/src/main/java/org/bitcoinj/examples/BackupToMnemonicSeed.java
@@ -41,6 +41,6 @@ public class BackupToMnemonicSeed {
         System.out.println("seed: " + seed.toString());
 
         System.out.println("creation time: " + seed.getCreationTimeSeconds());
-        System.out.println("mnemonicCode: " + Utils.join(seed.getMnemonicCode()));
+        System.out.println("mnemonicCode: " + Utils.SPACE_JOINER.join(seed.getMnemonicCode()));
     }
 }
diff --git a/wallettemplate/src/main/java/wallettemplate/WalletSettingsController.java b/wallettemplate/src/main/java/wallettemplate/WalletSettingsController.java
index acfcd91d..3eb3e542 100644
--- a/wallettemplate/src/main/java/wallettemplate/WalletSettingsController.java
+++ b/wallettemplate/src/main/java/wallettemplate/WalletSettingsController.java
@@ -84,7 +84,7 @@ public class WalletSettingsController {
         // Set the mnemonic seed words.
         final List<String> mnemonicCode = seed.getMnemonicCode();
         checkNotNull(mnemonicCode);    // Already checked for encryption.
-        String origWords = Utils.join(mnemonicCode);
+        String origWords = Utils.SPACE_JOINER.join(mnemonicCode);
         wordsArea.setText(origWords);
 
         // Validate words as they are being typed.