diff --git a/packages/backend/src/server/api/endpoints/notes/create.ts b/packages/backend/src/server/api/endpoints/notes/create.ts
index c5d42dabe4..168ce70c11 100644
--- a/packages/backend/src/server/api/endpoints/notes/create.ts
+++ b/packages/backend/src/server/api/endpoints/notes/create.ts
@@ -172,13 +172,32 @@ export const paramDef = {
 		},
 	},
 	// (re)note with text, files and poll are optional
-	anyOf: [
-		{ required: ['text'] },
-		{ required: ['renoteId'] },
-		{ required: ['fileIds'] },
-		{ required: ['mediaIds'] },
-		{ required: ['poll'] },
-	],
+	if: {
+		properties: {
+			renoteId: {
+				type: 'null',
+			},
+			fileIds: {
+				type: 'null',
+			},
+			mediaIds: {
+				type: 'null',
+			},
+			poll: {
+				type: 'null',
+			},
+		},
+	},
+	then: {
+		properties: {
+			text: {
+				type: 'string',
+				minLength: 1,
+				maxLength: MAX_NOTE_TEXT_LENGTH,
+				nullable: false,
+			},
+		},
+	},
 } as const;
 
 @Injectable()