diff --git a/lib/shared/drive-constraints.js b/lib/shared/drive-constraints.js
index 1f7cb763..4469ac8b 100644
--- a/lib/shared/drive-constraints.js
+++ b/lib/shared/drive-constraints.js
@@ -375,7 +375,7 @@ exports.getDriveImageCompatibilityStatuses = (drive, image) => {
       type: exports.COMPATIBILITY_STATUS_TYPES.ERROR,
       message: exports.COMPATIBILITY_STATUS_MESSAGES.LOCKED
     })
-  } else if (!_.isNil(drive) && !exports.isDriveLargeEnough(drive, image)) {
+  } else if (!_.isNil(drive) && !_.isNil(drive.size) && !exports.isDriveLargeEnough(drive, image)) {
     statusList.push({
       type: exports.COMPATIBILITY_STATUS_TYPES.ERROR,
       message: exports.COMPATIBILITY_STATUS_MESSAGES.TOO_SMALL
diff --git a/tests/shared/drive-constraints.spec.js b/tests/shared/drive-constraints.spec.js
index d8f42c4a..c5a28d09 100644
--- a/tests/shared/drive-constraints.spec.js
+++ b/tests/shared/drive-constraints.spec.js
@@ -1021,6 +1021,18 @@ describe('Shared: DriveConstraints', function () {
       })
     })
 
+    describe('given the drive size is null', () => {
+      it('should not return the too small error', function () {
+        this.image.size.final.value = this.drive.size + 1
+        this.drive.size = null
+
+        const result = constraints.getDriveImageCompatibilityStatuses(this.drive, this.image)
+        const expectedTuples = []
+
+        expectStatusTypesAndMessagesToBe(result, expectedTuples)
+      })
+    })
+
     describe('given the drive is locked', () => {
       it('should return the locked drive error', function () {
         this.drive.protected = true