diff --git a/src/main/java/com/google/crypto/tink/JsonKeysetReader.java b/src/main/java/com/google/crypto/tink/JsonKeysetReader.java
index 2bd68988b..3baa18085 100644
--- a/src/main/java/com/google/crypto/tink/JsonKeysetReader.java
+++ b/src/main/java/com/google/crypto/tink/JsonKeysetReader.java
@@ -163,7 +163,7 @@ public Keyset read() throws IOException {
     try {
       return keysetFromJson(
           JsonParser.parse(new String(Util.readAll(inputStream), UTF_8)).getAsJsonObject());
-    } catch (JsonParseException | IllegalStateException e) {
+    } catch (JsonParseException | IllegalStateException | UnsupportedOperationException e) {
       throw new IOException(e);
     } finally {
       if (inputStream != null) {
@@ -177,7 +177,7 @@ public EncryptedKeyset readEncrypted() throws IOException {
     try {
       return encryptedKeysetFromJson(
           JsonParser.parse(new String(Util.readAll(inputStream), UTF_8)).getAsJsonObject());
-    } catch (JsonParseException | IllegalStateException e) {
+    } catch (JsonParseException | IllegalStateException | UnsupportedOperationException e) {
       throw new IOException(e);
     } finally {
       if (inputStream != null) {