diff --git a/Makefile b/Makefile
index cb8e228..ca1c69f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 CONVERTER = python converter.py
 VALIDATE  = xmllint --schema
-SAXON     = java -jar $(wildcard saxon*.jar)
+SAXON     = java -jar $(firstword $(wildcard saxon*.jar))
 RM        = rm
 ECHO      = echo -e
 CURL      = curl --location