diff --git a/charts/external-dns/CHANGELOG.md b/charts/external-dns/CHANGELOG.md
index ef77ad7039..c0438990f0 100644
--- a/charts/external-dns/CHANGELOG.md
+++ b/charts/external-dns/CHANGELOG.md
@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Avoid creating cluster-scoped RBAC for Gateway API sources when running namespaced with `gatewayNamespace` set. Namespace listing permissions are now only added when `gatewayNamespace` is unset. ([#5843](https://github.com/kubernetes-sigs/external-dns/pull/5843)) _@TobyTheHutt_
+- Ensure container arguments are passed in as strings when extraArgs is a map ([#6284](https://github.com/kubernetes-sigs/external-dns/pull/6284)) _@vflaux_
 
 ## [v1.20.0]
 
diff --git a/charts/external-dns/templates/deployment.yaml b/charts/external-dns/templates/deployment.yaml
index b213f754fd..64c194f740 100644
--- a/charts/external-dns/templates/deployment.yaml
+++ b/charts/external-dns/templates/deployment.yaml
@@ -138,13 +138,13 @@ spec:
             {{- if not (kindIs "invalid" $value) }}
             {{- if kindIs "slice" $value }}
             {{- range $value }}
-            - --{{ $key }}={{ tpl (. | toString) $ }}
+            - {{ print "--" $key "=" (tpl (. | toString) $) | quote }}
             {{- end }}
             {{- else }}
-            - --{{ $key }}={{ tpl ($value | toString) $ }}
+            - {{ print "--" $key "=" (tpl ($value | toString) $) | quote }}
             {{- end }}
             {{- else }}
-            - --{{ $key }}
+            - {{ print "--" $key | quote }}
             {{- end }}
             {{- end }}
             {{- end }}
diff --git a/charts/external-dns/tests/deployment-flags_test.yaml b/charts/external-dns/tests/deployment-flags_test.yaml
index 5ea1115304..538c0bf8be 100644
--- a/charts/external-dns/tests/deployment-flags_test.yaml
+++ b/charts/external-dns/tests/deployment-flags_test.yaml
@@ -138,6 +138,7 @@ tests:
         extraArgC:
           - valueC-1
           - valueC-2
+        extraArgD: "valueD: D"
 
     asserts:
       - equal:
@@ -155,6 +156,7 @@ tests:
             - --extraArgB=valueB
             - --extraArgC=valueC-1
             - --extraArgC=valueC-2
+            - "--extraArgD=valueD: D"
 
 
   - it: should throw error when txtPrefix and txtSuffix are set