diff --git a/kernel/src/thread/Thread.cpp b/kernel/src/thread/Thread.cpp
index 8a44df98..93e08a2b 100644
--- a/kernel/src/thread/Thread.cpp
+++ b/kernel/src/thread/Thread.cpp
@@ -52,7 +52,7 @@ bool FileDescriptor::should_append()
 
 bool FileDescriptor::should_block()
 {
-    return flags & O_NONBLOCK;
+    return !(flags & O_NONBLOCK);
 }
 
 bool FileDescriptor::is_readable()