diff --git a/Userland/Libraries/LibCore/File.cpp b/Userland/Libraries/LibCore/File.cpp
index 2d9cec95cd..be65e1ddc1 100644
--- a/Userland/Libraries/LibCore/File.cpp
+++ b/Userland/Libraries/LibCore/File.cpp
@@ -85,7 +85,7 @@ int File::open_mode_to_options(OpenMode mode)
         flags |= O_EXCL;
     if (!has_flag(mode, OpenMode::KeepOnExec))
         flags |= O_CLOEXEC;
-    if (!has_flag(mode, OpenMode::Nonblocking))
+    if (has_flag(mode, OpenMode::Nonblocking))
         flags |= O_NONBLOCK;
 
     // Some open modes, like `ReadWrite` imply the ability to create the file if it doesn't exist.