diff --git a/arpspoof/Dockerfile b/arpspoof/Dockerfile
index 768026936..6d7b00682 100644
--- a/arpspoof/Dockerfile
+++ b/arpspoof/Dockerfile
@@ -17,7 +17,7 @@
 ARG BUILD_FROM
 ARG BUILD_VERSION
 ARG BUILD_UPSTREAM="1.0.0"
-FROM ${BUILD_FROM}${BUILD_UPSTREAM}
+FROM ${BUILD_FROM%?}${BUILD_UPSTREAM}
 
 ##################
 # 2 Modify Image #