diff --git a/genfiles b/genfiles
index e9ca428c951..237283029cd 100755
--- a/genfiles
+++ b/genfiles
@@ -4,6 +4,7 @@ STD='make -f Makefile.frag LEX="flex -L" YACC="bison -y -l" srcdir=.'
 
 (eval "$STD Zend/zend_language_parser.c Zend/zend_language_scanner.c Zend/zend_ini_parser.c Zend/zend_ini_scanner.c")
 
+set -x
 bison -y -l ext/standard/parsedate.y && mv y.tab.c ext/standard/parsedate.c
 
 for f in ext/standard/url_scanner_ex.c ext/standard/var_unserializer.c; do