diff --git a/Ports/python3/patches/ReadMe.md b/Ports/python3/patches/ReadMe.md
index 78ebc91d1e..08724930b1 100644
--- a/Ports/python3/patches/ReadMe.md
+++ b/Ports/python3/patches/ReadMe.md
@@ -14,7 +14,7 @@ Disables check for `RLIMIT_CORE` and subsequent `setrlimit()` call. Would be ena
 
 ## `fix-autoconf.patch`
 
-As usual, make the `configure` script recognize Serenity.
+As usual, make the `configure` script recognize Serenity. Also set `MACHDEP` (which is used for `sys.platform`) to a version-less `serenityos`, even when not cross-compiling.
 
 ## `remove-setlocale-from-preconfig.patch`
 
diff --git a/Ports/python3/patches/fix-autoconf.patch b/Ports/python3/patches/fix-autoconf.patch
index b156daf98f..1362ee3512 100644
--- a/Ports/python3/patches/fix-autoconf.patch
+++ b/Ports/python3/patches/fix-autoconf.patch
@@ -10,7 +10,7 @@
  		os=-sysv4
  		;;
 --- Python-3.9.5/configure.ac	2021-05-03 15:54:42.000000000 +0100
-+++ Python-3.9.5/configure.ac	2021-05-06 12:46:42.579733794 +0100
++++ Python-3.9.5/configure.ac	2021-05-06 16:40:34.503092204 +0100
 @@ -391,6 +391,9 @@
         # a lot of different things including 'define_xopen_source'
         # in the case statement below.
@@ -21,7 +21,15 @@
  	*-*-linux-android*)
  		ac_sys_system=Linux-android
  		;;
-@@ -437,6 +440,9 @@
+@@ -429,6 +432,7 @@
+ 	linux*) MACHDEP="linux";;
+ 	cygwin*) MACHDEP="cygwin";;
+ 	darwin*) MACHDEP="darwin";;
++	serenityos*) MACHDEP="serenityos";;
+ 	'')	MACHDEP="unknown";;
+     esac
+ fi
+@@ -437,6 +441,9 @@
  AC_SUBST(_PYTHON_HOST_PLATFORM)
  if test "$cross_compiling" = yes; then
  	case "$host" in
@@ -32,7 +40,7 @@
  		case "$host_cpu" in
  		arm*)
 --- Python-3.9.5/configure	2021-05-03 15:54:42.000000000 +0100
-+++ Python-3.9.5/configure	2021-05-06 12:48:56.875043814 +0100
++++ Python-3.9.5/configure	2021-05-06 16:39:39.108339089 +0100
 @@ -3295,6 +3295,9 @@
         # a lot of different things including 'define_xopen_source'
         # in the case statement below.
@@ -43,7 +51,15 @@
  	*-*-linux-android*)
  		ac_sys_system=Linux-android
  		;;
-@@ -3342,6 +3345,9 @@
+@@ -3333,6 +3336,7 @@
+ 	linux*) MACHDEP="linux";;
+ 	cygwin*) MACHDEP="cygwin";;
+ 	darwin*) MACHDEP="darwin";;
++	serenityos*) MACHDEP="serenityos";;
+ 	'')	MACHDEP="unknown";;
+     esac
+ fi
+@@ -3342,6 +3346,9 @@
 
  if test "$cross_compiling" = yes; then
  	case "$host" in
@@ -53,7 +69,7 @@
  	*-*-linux*)
  		case "$host_cpu" in
  		arm*)
-@@ -9646,6 +9652,7 @@
+@@ -9646,6 +9653,7 @@
  #	    LINKFORSHARED="-Wl,-E -Wl,+s -Wl,+b\$(BINLIBDEST)/lib-dynload";;
  	Linux-android*) LINKFORSHARED="-pie -Xlinker -export-dynamic";;
  	Linux*|GNU*) LINKFORSHARED="-Xlinker -export-dynamic";;