diff --git a/libc/src/__support/threads/linux/thread.cpp b/libc/src/__support/threads/linux/thread.cpp
--- a/libc/src/__support/threads/linux/thread.cpp
+++ b/libc/src/__support/threads/linux/thread.cpp
@@ -385,7 +385,7 @@
     name_buffer[retval - 1] = '\0';
   else
     name_buffer[retval] = '\0';
-  name << name_buffer;
+  name << name_buffer << cpp::StringStream::ENDS;
   return 0;
 }