diff --git a/book/makefile b/book/makefile
index 811c80c..c6a4423 100644
--- a/book/makefile
+++ b/book/makefile
@@ -263,8 +263,6 @@ show_tools_version:  # Show version of tools used on the build machine
 	@echo ""
 	- tidy -version
 	@echo ""
-	- kindlegen --version
-	@echo ""
 	- lacheck --version
 	@echo ""
 	- chktex --version