diff --git a/Dockerfile b/Dockerfile
index a280fa9..e1bfde2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,9 @@ ARG FORGE=10.13.4.1641
 ENV \
     ForgeUrl1=http://files.minecraftforge.net/maven/net/minecraftforge/forge/${MINECRAFT}-${FORGE}/forge-${MINECRAFT}-${FORGE}-installer.jar \
     ForgeUrl2=http://files.minecraftforge.net/maven/net/minecraftforge/forge/${MINECRAFT}-${FORGE}-${MINECRAFT}/forge-${MINECRAFT}-${FORGE}-${MINECRAFT}-installer.jar \
-    InstallerJar=forge-${MINECRAFT}-${FORGE}-installer.jar
+    InstallerJar=forge-${MINECRAFT}-${FORGE}-installer.jar \
+    MINECRAFT=$MINECRAFT \
+    FORGE=$FORGE
 
 ENV \
     INSTDIR=/usr/share/minecraft \