--- EV/Makefile.PL	2010/11/28 06:34:10	1.48
+++ EV/Makefile.PL	2010/12/30 07:37:38	1.49
@@ -252,7 +252,7 @@
 
 EOF
 
-$DEFINE .= " " . prompt "Any extra -D options?", $ENV{EV_EXTRA_DEFS};
+$DEFINE .= " " . prompt "Any extra -D options?", "$ENV{EV_EXTRA_DEFS}";
 
 print <<EOF;