diff --git a/run-registrar.sh b/run-registrar.sh
index 069213d61ddf53fe37def582840bce6241d86a0a..187e5f2cea95e2166e4285f8aeed9ff829986609 100755
--- a/run-registrar.sh
+++ b/run-registrar.sh
@@ -5,6 +5,9 @@ replace=""
 if test "$REGISTRAR_REPLACE" = true; then
     replace="--replace"
 fi
+if test "$REGISTRAR_REPLACE" = false; then
+    replace="--no-replace"
+fi
 
 debug="--no-debug"
 if test "$DEBUG" = true; then