diff --git a/src/pl/plperl/plperl.h b/src/pl/plperl/plperl.h
index 8feccb45cd3..c8aa185a3b6 100644
--- a/src/pl/plperl/plperl.h
+++ b/src/pl/plperl/plperl.h
@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
  * Portions Copyright (c) 1995, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/pl/plperl/plperl.h,v 1.5 2006/10/04 00:30:13 momjian Exp $
+ * $PostgreSQL: pgsql/src/pl/plperl/plperl.h,v 1.5.2.1 2007/11/22 17:47:32 tgl Exp $
  */
 
 #ifndef PL_PERL_H
@@ -38,6 +38,11 @@
 #define pTHX void
 #endif
 
+/* perl may have a different width of "bool", don't buy it */
+#ifdef bool
+#undef bool
+#endif
+
 /* routines from spi_internal.c */
 int			spi_DEBUG(void);
 int			spi_LOG(void);