diff --git a/H/pl-shared.h b/H/pl-shared.h
index ff1ef7cb7..ebef7851d 100755
--- a/H/pl-shared.h
+++ b/H/pl-shared.h
@@ -29,7 +29,7 @@
 // SWI Options
 #define O_STRING		1
 #define O_QUASIQUOTATIONS	1
-#define O_LOCALE		1
+//#define O_LOCALE		1
 //#define O_ATOMGC		1
 //#define O_CLAUSEGC		1
 #ifdef HAVE_GMP_H