diff --git a/conf/dachs-dockerfile b/conf/dachs-dockerfile
index 33e291e..da67550 100644
--- a/conf/dachs-dockerfile
+++ b/conf/dachs-dockerfile
@@ -86,10 +86,10 @@ RUN sed -i "/serverPort/c\serverPort:${DACHS_PORT}"  /etc/gavo.rc
 RUN sed -i "/corsOriginPat/c\corsOriginPat:${PROTOCOL}.*" /etc/gavo.rc
 
 RUN if [ "$SERVERNAME" = "localhost" ]; then \
-         sed -i "/serverURL/c\serverURL:" /etc/gavo.rc &&\
+         sed -i "/^serverURL/c\serverURL:" /etc/gavo.rc &&\
          echo "############################ WARNING gavo.rc overwrite -- use localhost for dev only ###############################"\
     ; else \
-         sed -i "/serverURL/c\serverURL:${PROTOCOL}://${SERVERNAME}.${DOMAIN}:${DACHS_PORT}" /etc/gavo.rc &&\
+         sed -i "/^serverURL/c\serverURL:${PROTOCOL}://${SERVERNAME}.${DOMAIN}:${DACHS_PORT}" /etc/gavo.rc &&\
          echo "Warning : gavo.rc overwritten by .env servername, domain, protocol and port values" \
     ; fi
 
--
libgit2 0.21.2