diff --git a/usr/src/cmd/mdb/Makefile.common b/usr/src/cmd/mdb/Makefile.common
index 99013197f9..e10b762909 100644
--- a/usr/src/cmd/mdb/Makefile.common
+++ b/usr/src/cmd/mdb/Makefile.common
@@ -51,12 +51,6 @@ COMMON_MODULES_PROC = \
 	mdb_ds \
 	mdb_test
 
-#
-# MDB modules used for debugging user processes which are only 64-bit
-#
-COMMON_MODULES_PROC_64BIT = \
-	libpython
-
 #
 # MDB modules used for debugging user processes which are only 32-bit
 #