Ensure backward compatibility

[gitmo/Mouse.git] / xs-src / mouse_util.xs

diff --git a/xs-src/mouse_util.xs b/xs-src/mouse_util.xs
index f041951..94239c8 100644 (file)
--- a/xs-src/mouse_util.xs
+++ b/xs-src/mouse_util.xs
@@ -2,7 +2,7 @@
 
 #define ISA_CACHE "::LINEALIZED_ISA_CACHE::"
 
-#ifndef no_mro_get_linear_isa
+#ifdef no_mro_get_linear_isa
 AV*
 mouse_mro_get_linear_isa(pTHX_ HV* const stash){
        GV* const cachegv = *(GV**)hv_fetchs(stash, ISA_CACHE, TRUE);