diff --git a/tasks/configure.yml b/tasks/configure.yml
index 642f2de..6a82de7 100644
--- a/tasks/configure.yml
+++ b/tasks/configure.yml
@@ -4,9 +4,9 @@
   environment:
     RESTIC_REPOSITORY: '{{ item.value.location }}'
     RESTIC_PASSWORD: '{{ item.value.password }}'
-    AWS_ACCESS_KEY_ID: '{{ item.value.aws_access_key | default(omit) }}'
-    AWS_SECRET_ACCESS_KEY: '{{ item.value.aws_secret_access_key | default(omit) }}'
-    AWS_DEFAULT_REGION: '{{ item.value.aws_default_region | default(omit) }}'
+    AWS_ACCESS_KEY_ID: '{{ item.value.aws_access_key | default("") }}'
+    AWS_SECRET_ACCESS_KEY: '{{ item.value.aws_secret_access_key | default("") }}'
+    AWS_DEFAULT_REGION: '{{ item.value.aws_default_region | default("") }}'
   no_log: true
   register: restic_init
   changed_when: "'created restic repository' in restic_init.stdout"