diff --git a/util/mk1mf.pl b/util/mk1mf.pl
index 3da139dd326d21d7a2c4dc27dad4ee093745099c..b05c4aeed4e255482b5e26dba17c876526da811f 100755
--- a/util/mk1mf.pl
+++ b/util/mk1mf.pl
@@ -455,10 +455,13 @@ for (;;)
 	}
 close(IN);
 
-# Remove opensslconf.h so it doesn't get updated if we configure a
-# different branch.
-$exheader =~ s/[^ ]+\/opensslconf.h//;
-$header =~ s/[^ ]+\/opensslconf.h//;
+if ($orig_platform eq 'copy')
+	{
+	# Remove opensslconf.h so it doesn't get updated if we configure a
+	# different branch.
+	$exheader =~ s/[^ ]+\/opensslconf.h//;
+	$header =~ s/[^ ]+\/opensslconf.h//;
+	}
 
 if ($fips)
 	{