diff --git a/Linux/Windows.py b/Linux/Windows.py
index d76f8f9..122ca5c 100644
--- a/Linux/Windows.py
+++ b/Linux/Windows.py
@@ -346,8 +346,8 @@ class NewPost(Helper.RestorableWindow):
 		self.statusBar().showMessage(str(count))
 
 	def sendMessage(self):
-		count = 256 - len(self.textInput.toPlainText())
-		if count >= 0:
+		count = len(self.textInput.toPlainText())
+		if count > 0 and count <= 256:
 			message = Helper.PostModel()
 			message.text = unicode(self.textInput.toPlainText().toUtf8(), "utf-8")
 			message.inReplyTostatusId = self.status_id
diff --git a/Mac/NewMessageWindow.m b/Mac/NewMessageWindow.m
index e814a8d..089a907 100644
--- a/Mac/NewMessageWindow.m
+++ b/Mac/NewMessageWindow.m
@@ -225,7 +225,7 @@
 #pragma mark Keyboard delegate methods
 
 - (IBAction)sendPost:(NSControl *)control {
-	if ([[control stringValue] length] <= MESSAGE_MAX_LENGTH) {
+	if ([[control stringValue] length] <= MESSAGE_MAX_LENGTH && [[control stringValue] length] > 0) {
 		PostModel *post = [[[PostModel alloc] init] autorelease];
 		post.text = [control stringValue];
 		post.inReplyTostatusId = inReplyTostatusId;