diff --git a/Modules/Setup.in b/Modules/Setup.in
index 3eb30c5..106e97a 100644
--- a/Modules/Setup.in
+++ b/Modules/Setup.in
@@ -76,7 +76,7 @@
 TESTPATH=:test
 
 # Path components for machine- or system-dependent modules and shared libraries
-MACHDEPPATH=:$(MACHDEP)
+MACHDEPPATH=:plat-$(MACHDEP)
 
 COREPYTHONPATH=$(DESTPATH)$(SITEPATH)$(TESTPATH)$(MACHDEPPATH)$(STDWINPATH)$(TKPATH)
 PYTHONPATH=$(COREPYTHONPATH)