diff --git a/Makefile.pre.in b/Makefile.pre.in
index e6598f2914f..6a6325e9306 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -881,4 +881,8 @@ funny:
 		-o -name MANIFEST \
 		-o -print
 
+# Dependencies
+
+Python/thread.o: $(srcdir)/Python/thread_*.h
+
 # IF YOU PUT ANYTHING HERE IT WILL GO AWAY