diff --git a/src/Components/CreateImageWizard/utilities/useValidation.tsx b/src/Components/CreateImageWizard/utilities/useValidation.tsx
index 04a20b57..2307c6d2 100644
--- a/src/Components/CreateImageWizard/utilities/useValidation.tsx
+++ b/src/Components/CreateImageWizard/utilities/useValidation.tsx
@@ -140,10 +140,14 @@ export function useFirstBootValidation(): StepValidation {
 export function useHostnameValidation(): StepValidation {
   const hostname = useAppSelector(selectHostname);
 
+  // Error message taken from hostname man page (`man 5 hostname`)
+  const errorMessage =
+    'Invalid hostname. The hostname should be composed of up to 64 7-bit ASCII lower-case alphanumeric characters or hyphens forming a valid DNS domain name. It is recommended that this name contains only a single label, i.e. without any dots.';
+
   if (!isHostnameValid(hostname)) {
     return {
       errors: {
-        hostname: 'Invalid hostname',
+        hostname: errorMessage,
       },
       disabledNext: true,
     };
diff --git a/src/Components/CreateImageWizard/validators.ts b/src/Components/CreateImageWizard/validators.ts
index 1e03f8e6..c2525d79 100644
--- a/src/Components/CreateImageWizard/validators.ts
+++ b/src/Components/CreateImageWizard/validators.ts
@@ -92,10 +92,14 @@ export const isNtpServerValid = (ntpServer: string) => {
 };
 
 export const isHostnameValid = (hostname: string) => {
-  if (hostname !== '') {
-    return /^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9-]*[A-Za-z0-9])$/.test(
-      hostname
-    );
+  switch (true) {
+    case hostname.length > 63:
+      return false;
+    case hostname !== '':
+      return /^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9-]*[A-Za-z0-9])$/.test(
+        hostname
+      );
+    default:
+      return true;
   }
-  return true;
 };