diff --git a/electrum b/electrum
index e0f5dd6f0..338f8c1d4 100755
--- a/electrum
+++ b/electrum
@@ -37,7 +37,8 @@ elif is_bundle and sys.platform=='darwin':
 
 # pure-python dependencies need to be imported here for pyinstaller
 try:
-    import dns
+    if not is_android:
+        import dns
     import aes
     import ecdsa
     import requests
diff --git a/lib/bitcoin.py b/lib/bitcoin.py
index 5e3f6723c..1cbbf4629 100644
--- a/lib/bitcoin.py
+++ b/lib/bitcoin.py
@@ -201,6 +201,7 @@ def hash_160(public_key):
         md.update(sha256(public_key))
         return md.digest()
     except Exception:
+        # not available in Android SL4a
         import ripemd
         md = ripemd.new(sha256(public_key))
         return md.digest()