diff --git a/configure.ac b/configure.ac
index f01b07862..3659e6dca 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1312,7 +1312,7 @@ fi
 AM_CONDITIONAL(RUBY_GEMS_INSTALL, [test "x$ruby_gems_install" = xtrue])
 
 if test x$python_eggs = xtrue; then
-	PYTHON_PACKAGE_VERSION=`echo "$PACKAGE_VERSION" | $SED 's/dr/dev/'`
+	PYTHON_PACKAGE_VERSION=`echo "$PACKAGE_VERSION" | $SED 's/dr/.dev/'`
 	AC_SUBST([PYTHON_PACKAGE_VERSION])
 	if test x$python_eggs_install = xtrue; then
 		AC_PATH_PROG([EASY_INSTALL], [easy_install], [], [$PATH:/bin:/usr/bin:/usr/local/bin])