diff --git a/Handbook/GNUmakefile b/Handbook/GNUmakefile
index 97af5269..3abea367 100644
--- a/Handbook/GNUmakefile
+++ b/Handbook/GNUmakefile
@@ -51,7 +51,6 @@ SG_PLUGIN_FILE			:=	$(SG_PLUGIN_DIR)/SenseGlove.uplugin
 
 SG_DOCUMENTATION_URL			:=	https://unreal.docs.senseglove.com
 SG_DOCUMENTATION_DIR			:=	$(SG_PLUGIN_DIR)/Documentation
-SG_DOCUMENTATION_EPUB_DIR		:=	$(SG_DOCUMENTATION_DIR)/epub
 SG_DOCUMENTATION_HTML_DIR_NAME	:=	html
 SG_DOCUMENTATION_HTML_DIR		:=	$(SG_DOCUMENTATION_DIR)/$(SG_DOCUMENTATION_HTML_DIR_NAME)
 SG_DOCUMENTATION_PDF_DIR		:=	$(SG_DOCUMENTATION_DIR)/pdf-outline