diff --git a/src/plugins/quota/quota.c b/src/plugins/quota/quota.c
index 830a79b78f..40422e0b49 100644
--- a/src/plugins/quota/quota.c
+++ b/src/plugins/quota/quota.c
@@ -1275,7 +1275,7 @@ enum quota_alloc_result quota_try_alloc(struct quota_transaction_context *ctx,
 	/* with quota_try_alloc() we want to keep track of how many bytes
 	   we've been adding/removing, so disable auto_updating=TRUE
 	   optimization. this of course doesn't work perfectly if
-	   quota_alloc() or quota_free*() was already used within the same
+	   quota_alloc() or quota_free_bytes() was already used within the same
 	   transaction, but that doesn't normally happen. */
 	ctx->auto_updating = FALSE;
 	quota_alloc(ctx, mail);
@@ -1349,18 +1349,6 @@ void quota_alloc(struct quota_transaction_context *ctx, struct mail *mail)
 	ctx->count_used++;
 }
 
-void quota_free(struct quota_transaction_context *ctx, struct mail *mail)
-{
-	uoff_t size;
-
-	if (ctx->auto_updating)
-		return;
-	if (quota_get_mail_size(ctx, mail, &size) < 0)
-		quota_recalculate(ctx, QUOTA_RECALCULATE_MISSING_FREES);
-	else
-		quota_free_bytes(ctx, size);
-}
-
 void quota_free_bytes(struct quota_transaction_context *ctx,
 		      uoff_t physical_size)
 {
diff --git a/src/plugins/quota/quota.h b/src/plugins/quota/quota.h
index 8663d2b2cb..131bd4b396 100644
--- a/src/plugins/quota/quota.h
+++ b/src/plugins/quota/quota.h
@@ -108,7 +108,6 @@ enum quota_alloc_result quota_test_alloc(struct quota_transaction_context *ctx,
 					 uoff_t size);
 /* Update quota by allocating/freeing space used by mail. */
 void quota_alloc(struct quota_transaction_context *ctx, struct mail *mail);
-void quota_free(struct quota_transaction_context *ctx, struct mail *mail);
 void quota_free_bytes(struct quota_transaction_context *ctx,
 		      uoff_t physical_size);
 /* Mark the quota to be recalculated */