diff --git a/config/python.m4 b/config/python.m4
index de346fb53a..fc6afab9f9 100644
--- a/config/python.m4
+++ b/config/python.m4
@@ -45,7 +45,7 @@ if a == b:
 else:
     print(a + ' ' + b)"`
 if test "$PORTNAME" = win32 ; then
-    python_includespec=`echo $python_includespec | sed 's,[\],/,g'`
+    python_includespec=`echo $python_includespec | sed 's,[[\]],/,g'`
 fi
 AC_MSG_RESULT([$python_includespec])
 
diff --git a/configure b/configure
index 191e8f0326..24c04301a6 100755
--- a/configure
+++ b/configure
@@ -7488,7 +7488,7 @@ if a == b:
 else:
     print(a + ' ' + b)"`
 if test "$PORTNAME" = win32 ; then
-    python_includespec=`echo $python_includespec | sed 's,\,/,g'`
+    python_includespec=`echo $python_includespec | sed 's,[\],/,g'`
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $python_includespec" >&5
 $as_echo "$python_includespec" >&6; }