diff --git a/src/main/java/eu/siacs/conversations/entities/Message.java b/src/main/java/eu/siacs/conversations/entities/Message.java
index 5b8adb9cf..6c53134aa 100644
--- a/src/main/java/eu/siacs/conversations/entities/Message.java
+++ b/src/main/java/eu/siacs/conversations/entities/Message.java
@@ -8,6 +8,7 @@ import android.util.Log;
 
 import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableSet;
+import com.google.common.primitives.Longs;
 
 import org.json.JSONException;
 
@@ -849,10 +850,10 @@ public class Message extends AbstractEntity implements AvatarService.Avatarable
                     fileParams.height = parseInt(parts[3]);
                 case 2:
                     fileParams.url = URL.tryParse(parts[0]);
-                    fileParams.size = parseLong(parts[1]);
+                    fileParams.size = Longs.tryParse(parts[1]);
                     break;
                 case 3:
-                    fileParams.size = parseLong(parts[0]);
+                    fileParams.size = Longs.tryParse(parts[0]);
                     fileParams.width = parseInt(parts[1]);
                     fileParams.height = parseInt(parts[2]);
                     break;
@@ -861,14 +862,6 @@ public class Message extends AbstractEntity implements AvatarService.Avatarable
         return fileParams;
     }
 
-    private static long parseLong(String value) {
-        try {
-            return Long.parseLong(value);
-        } catch (NumberFormatException e) {
-            return 0;
-        }
-    }
-
     private static int parseInt(String value) {
         try {
             return Integer.parseInt(value);
@@ -905,10 +898,14 @@ public class Message extends AbstractEntity implements AvatarService.Avatarable
 
     public static class FileParams {
         public String url;
-        public long size = 0;
+        public Long size = null;
         public int width = 0;
         public int height = 0;
         public int runtime = 0;
+
+        public long getSize() {
+            return size == null ? 0 : size;
+        }
     }
 
     public void setFingerprint(String fingerprint) {
diff --git a/src/main/java/eu/siacs/conversations/http/HttpDownloadConnection.java b/src/main/java/eu/siacs/conversations/http/HttpDownloadConnection.java
index 09e9121ba..b41962d78 100644
--- a/src/main/java/eu/siacs/conversations/http/HttpDownloadConnection.java
+++ b/src/main/java/eu/siacs/conversations/http/HttpDownloadConnection.java
@@ -83,7 +83,7 @@ public class HttpDownloadConnection implements Transferable {
             final Message.FileParams fileParams = message.getFileParams();
             if (message.hasFileOnRemoteHost()) {
                 mUrl = AesGcmURL.of(fileParams.url);
-            } else if (message.isOOb() && fileParams.url != null && fileParams.size > 0) {
+            } else if (message.isOOb() && fileParams.url != null && fileParams.size != null) {
                 mUrl = AesGcmURL.of(fileParams.url);
             } else {
                 mUrl = AesGcmURL.of(message.getBody().split("\n")[0]);
@@ -106,8 +106,8 @@ public class HttpDownloadConnection implements Transferable {
                 this.message.setEncryption(Message.ENCRYPTION_NONE);
             }
             //TODO add auth tag size to knownFileSize
-            final long knownFileSize = message.getFileParams().size;
-            if (knownFileSize > 0 && interactive) {
+            final Long knownFileSize = message.getFileParams().size;
+            if (knownFileSize != null && interactive) {
                 this.file.setExpectedSize(knownFileSize);
                 download(true);
             } else {
diff --git a/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java b/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java
index 27858484e..7bbd4c8e5 100644
--- a/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java
+++ b/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java
@@ -1863,7 +1863,7 @@ public class ConversationFragment extends XmppFragment implements EditMessage.Ke
                 if (!message.hasFileOnRemoteHost()
                         && xmppConnection != null
                         && conversation.getMode() == Conversational.MODE_SINGLE
-                        && !xmppConnection.getFeatures().httpUpload(message.getFileParams().size)) {
+                        && !xmppConnection.getFeatures().httpUpload(message.getFileParams().getSize())) {
                     activity.selectPresence(conversation, () -> {
                         message.setCounterpart(conversation.getNextCounterpart());
                         activity.xmppConnectionService.resendFailedMessages(message);
diff --git a/src/main/java/eu/siacs/conversations/ui/adapter/MessageAdapter.java b/src/main/java/eu/siacs/conversations/ui/adapter/MessageAdapter.java
index caba4ce64..587e834b3 100644
--- a/src/main/java/eu/siacs/conversations/ui/adapter/MessageAdapter.java
+++ b/src/main/java/eu/siacs/conversations/ui/adapter/MessageAdapter.java
@@ -184,7 +184,7 @@ public class MessageAdapter extends ArrayAdapter<Message> {
                 && message.getMergedStatus() <= Message.STATUS_RECEIVED;
         if (message.isFileOrImage() || transferable != null || MessageUtils.unInitiatedButKnownSize(message)) {
             FileParams params = message.getFileParams();
-            filesize = params.size > 0 ? UIHelper.filesizeToString(params.size) : null;
+            filesize = params.size != null ? UIHelper.filesizeToString(params.size) : null;
             if (transferable != null && (transferable.getStatus() == Transferable.STATUS_FAILED || transferable.getStatus() == Transferable.STATUS_CANCELLED)) {
                 error = true;
             }
diff --git a/src/main/java/eu/siacs/conversations/utils/MessageUtils.java b/src/main/java/eu/siacs/conversations/utils/MessageUtils.java
index 9fc6c5ca8..3cb6338db 100644
--- a/src/main/java/eu/siacs/conversations/utils/MessageUtils.java
+++ b/src/main/java/eu/siacs/conversations/utils/MessageUtils.java
@@ -115,6 +115,6 @@ public class MessageUtils {
     }
 
     public static boolean unInitiatedButKnownSize(Message message) {
-        return message.getType() == Message.TYPE_TEXT && message.getTransferable() == null && message.isOOb() && message.getFileParams().size > 0 && message.getFileParams().url != null;
+        return message.getType() == Message.TYPE_TEXT && message.getTransferable() == null && message.isOOb() && message.getFileParams().size != null && message.getFileParams().url != null;
     }
 }