diff --git a/app/soapbox/api/hooks/accounts/useAccountLookup.ts b/app/soapbox/api/hooks/accounts/useAccountLookup.ts
index ffe5885de..ed73617aa 100644
--- a/app/soapbox/api/hooks/accounts/useAccountLookup.ts
+++ b/app/soapbox/api/hooks/accounts/useAccountLookup.ts
@@ -22,7 +22,7 @@ function useAccountLookup(acct: string | undefined, opts: UseAccountLookupOpts =
 
   const { entity: account, isUnauthorized, ...result } = useEntityLookup<Account>(
     Entities.ACCOUNTS,
-    (account) => account.acct === acct,
+    (account) => account.acct.toLowerCase() === acct?.toLowerCase(),
     () => api.get(`/api/v1/accounts/lookup?acct=${acct}`),
     { schema: accountSchema, enabled: !!acct },
   );
diff --git a/app/soapbox/api/hooks/groups/useGroupLookup.ts b/app/soapbox/api/hooks/groups/useGroupLookup.ts
index e3a979777..8e161af78 100644
--- a/app/soapbox/api/hooks/groups/useGroupLookup.ts
+++ b/app/soapbox/api/hooks/groups/useGroupLookup.ts
@@ -16,7 +16,7 @@ function useGroupLookup(slug: string) {
 
   const { entity: group, isUnauthorized, ...result } = useEntityLookup(
     Entities.GROUPS,
-    (group) => group.slug === slug,
+    (group) => group.slug.toLowerCase() === slug.toLowerCase(),
     () => api.get(`/api/v1/groups/lookup?name=${slug}`),
     { schema: groupSchema, enabled: features.groups && !!slug },
   );