diff --git a/src/com/annimon/everlastingsummer/IOUtil.java b/src/com/annimon/everlastingsummer/IOUtil.java
index 52fd916..e279c9c 100644
--- a/src/com/annimon/everlastingsummer/IOUtil.java
+++ b/src/com/annimon/everlastingsummer/IOUtil.java
@@ -26,9 +26,11 @@ public final class IOUtil {
         return result;
     }
     
+    private static FileInputStream streamForFD;
     public static FileDescriptor getFD(String file) throws IOException {
-        // TODO: is = ...; result = ..getFD; is.close; return result
-        return new FileInputStream(ES + file).getFD();
+        if (streamForFD != null) streamForFD.close();
+        streamForFD = new FileInputStream(ES + file);
+        return streamForFD.getFD();
     }
     
     public static InputStream open(String file) throws IOException {