diff --git a/Makefile b/Makefile
index aefb58dde73cbb66d5c7845e2ee5fd9d6ac11a57..ed281a1660e23ed3eb88253236ccad4b7fdc893a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 run:
-	rm build/asciidoc/pdf/*.pdf
-	gradle asciidoctor --no-daemon
+	rm -f build/asciidoc/pdf/*.pdf
+	JAVA_OPTS="-Xmx2G" ./gradlew --no-daemon asciidoctor
 view:
 	open build/asciidoc/pdf/prob_user_manual.pdf
 viewd: