diff --git a/games/fortune/datfiles/Makefile b/games/fortune/datfiles/Makefile
index 024e134dab05..57794101fb27 100644
--- a/games/fortune/datfiles/Makefile
+++ b/games/fortune/datfiles/Makefile
@@ -37,6 +37,6 @@ fortunes-o.dat: fortunes-o
 	    strfile -Csx ${.ALLSRC} ${.TARGET}
 
 fortunes-o: fortunes-o.${TYPE}
-	tr a-zA-Z n-za-mN-ZA-M < ${.ALLSRC} > ${.TARGET}
+	LANG=C tr a-zA-Z n-za-mN-ZA-M < ${.ALLSRC} > ${.TARGET}
 
 .include <bsd.prog.mk>