diff --git a/core/entrypoint.sh b/core/entrypoint.sh
index 9bdf90fe441b8ff74bbb216f1a1f20c5e6bf2b96..53db3a0be062bf8cea9d6808e9aead3021498ce0 100644
--- a/core/entrypoint.sh
+++ b/core/entrypoint.sh
@@ -29,11 +29,10 @@ file_env() {
 		val="$(< "${!fileVar}")"
 	fi
 	cat >> /etc/bash.bashrc <<EOF
-export ${var}=${val}
 EOF
 	echo "the value of variable ${var} is set" >&2
   # make them also available in preparatory steps until container starts
-  export ${var}=${val}
+  export "${var}"="${val}"
 	unset "$fileVar"
 }