diff --git a/packages/backend/src/core/NoteCreateService.ts b/packages/backend/src/core/NoteCreateService.ts
index 3bfced1d80..f24c665659 100644
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@@ -486,10 +486,10 @@ export class NoteCreateService implements OnApplicationShutdown {
 
 		// should really not happen, but better safe than sorry
 		if (data.reply?.id === insert.id) {
-			throw new Error("A note can't reply to itself");
+			throw new Error('A note can\'t reply to itself');
 		}
 		if (data.renote?.id === insert.id) {
-			throw new Error("A note can't renote itself");
+			throw new Error('A note can\'t renote itself');
 		}
 
 		if (data.uri != null) insert.uri = data.uri;
diff --git a/packages/backend/src/core/NoteEditService.ts b/packages/backend/src/core/NoteEditService.ts
index 453ad5d9d0..18912181d7 100644
--- a/packages/backend/src/core/NoteEditService.ts
+++ b/packages/backend/src/core/NoteEditService.ts
@@ -309,7 +309,7 @@ export class NoteEditService implements OnApplicationShutdown {
 
 		if (this.isRenote(data)) {
 			if (data.renote.id === oldnote.id) {
-				throw new Error("A note can't renote itself");
+				throw new Error('A note can\'t renote itself');
 			}
 
 			switch (data.renote.visibility) {