diff --git a/src/java/com/threerings/util/StreamableArrayList.java b/src/java/com/threerings/util/StreamableArrayList.java
index dcc53d8cc..56fb5e07e 100644
--- a/src/java/com/threerings/util/StreamableArrayList.java
+++ b/src/java/com/threerings/util/StreamableArrayList.java
@@ -1,5 +1,5 @@
 //
-// $Id: StreamableArrayList.java,v 1.2 2004/08/27 02:20:36 mdb Exp $
+// $Id$
 //
 // Narya library - tools for developing networked games
 // Copyright (C) 2002-2004 Three Rings Design, Inc., All Rights Reserved
@@ -57,6 +57,7 @@ public class StreamableArrayList extends ArrayList
         throws IOException, ClassNotFoundException
     {
         int ecount = in.readInt();
+        ensureCapacity(ecount);
         for (int ii = 0; ii < ecount; ii++) {
             add(in.readObject());
         }
diff --git a/src/java/com/threerings/util/StreamableHashIntMap.java b/src/java/com/threerings/util/StreamableHashIntMap.java
index 62d4fcc7a..335e8790a 100644
--- a/src/java/com/threerings/util/StreamableHashIntMap.java
+++ b/src/java/com/threerings/util/StreamableHashIntMap.java
@@ -1,5 +1,5 @@
 //
-// $Id: StreamableHashIntMap.java,v 1.4 2004/08/27 02:20:36 mdb Exp $
+// $Id$
 //
 // Narya library - tools for developing networked games
 // Copyright (C) 2002-2004 Three Rings Design, Inc., All Rights Reserved
@@ -79,6 +79,7 @@ public class StreamableHashIntMap extends HashIntMap
         throws IOException, ClassNotFoundException
     {
         int ecount = in.readInt();
+        ensureCapacity(ecount);
         for (int ii = 0; ii < ecount; ii++) {
             int key = in.readInt();
             put(key, in.readObject());
diff --git a/src/java/com/threerings/util/StreamableIntIntMap.java b/src/java/com/threerings/util/StreamableIntIntMap.java
index cb36f3864..3239254b6 100644
--- a/src/java/com/threerings/util/StreamableIntIntMap.java
+++ b/src/java/com/threerings/util/StreamableIntIntMap.java
@@ -79,6 +79,7 @@ public class StreamableIntIntMap extends IntIntMap
         throws IOException, ClassNotFoundException
     {
         int ecount = in.readInt();
+        ensureCapacity(ecount);
         for (int ii = 0; ii < ecount; ii++) {
             int key = in.readInt();
             put(key, in.readInt());