diff --git a/extensions/configuration-editing/schemas/attachContainer.schema.json b/extensions/configuration-editing/schemas/attachContainer.schema.json
index d2ea16a783a..2bce4ff6f00 100644
--- a/extensions/configuration-editing/schemas/attachContainer.schema.json
+++ b/extensions/configuration-editing/schemas/attachContainer.schema.json
@@ -21,7 +21,10 @@
 				"remoteEnv": {
 					"type": "object",
 					"additionalProperties": {
-						"type": "string"
+						"type": [
+							"string",
+							"null"
+						]
 					},
 					"description": "Remote environment variables."
 				},
diff --git a/extensions/configuration-editing/schemas/devContainer.schema.json b/extensions/configuration-editing/schemas/devContainer.schema.json
index 9c1d7aad1a3..5a1ace7e41f 100644
--- a/extensions/configuration-editing/schemas/devContainer.schema.json
+++ b/extensions/configuration-editing/schemas/devContainer.schema.json
@@ -25,7 +25,10 @@
 				"remoteEnv": {
 					"type": "object",
 					"additionalProperties": {
-						"type": "string"
+						"type": [
+							"string",
+							"null"
+						]
 					},
 					"description": "Remote environment variables."
 				},