diff --git a/src/stubs/win32/opamWindows.c b/src/stubs/win32/opamWindows.c
index c4132f72102..837c57c467d 100644
--- a/src/stubs/win32/opamWindows.c
+++ b/src/stubs/win32/opamWindows.c
@@ -680,8 +680,8 @@ CAMLprim value OPAMW_GetProcessAncestry(value unit)
                 }
                 cur->LowPart = entry.th32ProcessID;
                 cur->HighPart = entry.th32ParentProcessID;
+                cur[1].QuadPart = 0LL;
                 if (cur->LowPart == target) {
-                  cur[1].QuadPart = 0LL;
                   break;
                 } else {
                   cur++;