diff --git a/src/sync.d b/src/sync.d
index ce1e6ca5d..99bb7f260 100644
--- a/src/sync.d
+++ b/src/sync.d
@@ -1345,13 +1345,11 @@ class SyncEngine {
 			}
 			
 			// Microsoft OneDrive OneNote file objects will report as files but have 'application/msonenote' as their mime type
-			// Is there a 'file' JSON element?
-			if ("file" in onedriveJSONItem) {
-				if (isMicrosoftOneNoteMimeType1(onedriveJSONItem)) {
-					// Log that this was skipped as this was a Microsoft OneNote item and unsupported
-					if (verboseLogging) {addLogEntry("Skipping path - The Microsoft OneNote Notebook File '" ~ generatePathFromJSONData(onedriveJSONItem) ~ "' is not supported by this client", ["verbose"]);}
-					discardDeltaJSONItem = true;
-				}
+			// Is there a 'file' JSON element and it has a 'mimeType' element and the mimeType is 'application/msonenote'
+			if (isItemFile(onedriveJSONItem) && hasMimeType(onedriveJSONItem) && isMicrosoftOneNoteMimeType1(onedriveJSONItem)) {
+				// Log that this was skipped as this was a Microsoft OneNote item and unsupported
+				if (verboseLogging) {addLogEntry("Skipping path - The Microsoft OneNote Notebook File '" ~ generatePathFromJSONData(onedriveJSONItem) ~ "' is not supported by this client", ["verbose"]);}
+				discardDeltaJSONItem = true;
 			}
 			
 			// If we are not self-generating a /delta response, check this initial /delta JSON bundle item against the basic checks 
diff --git a/src/util.d b/src/util.d
index 17b928d13..47f8a3b3c 100644
--- a/src/util.d
+++ b/src/util.d
@@ -972,6 +972,10 @@ bool hasId(JSONValue item) {
 	return ("id" in item) != null;
 }
 
+bool hasMimeType(const ref JSONValue item) {
+	return ("mimeType" in item["file"]) != null;
+}
+
 bool hasQuota(JSONValue item) {
 	return ("quota" in item) != null;
 }