diff --git a/Misc/NEWS.d/next/Windows/2019-02-02-11-02-44.bpo-32560.I5WAGW.rst b/Misc/NEWS.d/next/Windows/2019-02-02-11-02-44.bpo-32560.I5WAGW.rst
new file mode 100644
index 00000000000..bf2bf113e24
--- /dev/null
+++ b/Misc/NEWS.d/next/Windows/2019-02-02-11-02-44.bpo-32560.I5WAGW.rst
@@ -0,0 +1,2 @@
+The ``py`` launcher now forwards its ``STARTUPINFO`` structure to child
+processes.
diff --git a/PC/launcher.c b/PC/launcher.c
index a78620a8924..a4e678115f3 100644
--- a/PC/launcher.c
+++ b/PC/launcher.c
@@ -666,7 +666,7 @@ run_child(wchar_t * cmdline)
     if (!ok)
         error(RC_CREATE_PROCESS, L"Job information setting failed");
     memset(&si, 0, sizeof(si));
-    si.cb = sizeof(si);
+    GetStartupInfoW(&si);
     ok = safe_duplicate_handle(GetStdHandle(STD_INPUT_HANDLE), &si.hStdInput);
     if (!ok)
         error(RC_NO_STD_HANDLES, L"stdin duplication failed");