diff --git a/cpan/Time-Piece/Piece.xs b/cpan/Time-Piece/Piece.xs
index 757c1af765ae..009dbaca0953 100644
--- a/cpan/Time-Piece/Piece.xs
+++ b/cpan/Time-Piece/Piece.xs
@@ -1,4 +1,5 @@
 #define PERL_NO_GET_CONTEXT
+#define PERL_REENTRANT
 #include "EXTERN.h"
 #include "perl.h"
 #include "XSUB.h"