diff --git a/src/native/libs/System.Native/pal_io.c b/src/native/libs/System.Native/pal_io.c
index 82a6c190d9fa9b..e444dedd57406b 100644
--- a/src/native/libs/System.Native/pal_io.c
+++ b/src/native/libs/System.Native/pal_io.c
@@ -344,6 +344,9 @@ intptr_t SystemNative_Open(const char* path, int32_t flags, int32_t mode)
         return -1;
     }
 
+    // Prevent terminal devices from becoming the controlling terminal of this process.
+    flags |= O_NOCTTY;
+
     int result;
     while ((result = open(path, flags, (mode_t)mode)) < 0 && errno == EINTR);
 #if !HAVE_O_CLOEXEC