diff --git a/hooks/build b/hooks/build
index 0425c8d..de357ab 100644
--- a/hooks/build
+++ b/hooks/build
@@ -2,7 +2,7 @@
 
 # $IMAGE_NAME var is injected into the build so the tag is correct. 
 
-docker build --build-arg VCS_REF=`git rev-parse —-short HEAD` \
+docker build --build-arg VCS_REF=`git rev-parse --short HEAD` \
   --build-arg VCS_URL=`git config --get remote.origin.url` \
   --build-arg BUILD_DATE=`date -u +”%Y-%m-%dT%H:%M:%SZ”` \
   -t $IMAGE_NAME .