diff --git a/packages/consts/src/regexs.ts b/packages/consts/src/regexs.ts
index e76f0ca75..fa0e14cba 100644
--- a/packages/consts/src/regexs.ts
+++ b/packages/consts/src/regexs.ts
@@ -56,7 +56,7 @@ export const APIFY_PROXY_VALUE_REGEX = /^[\w._~]+$/;
 // http://123123:qweqwe:asdasd@proxy.com:55555
 // http://proxy.apify.com:5000
 // http://root@proxy.apify.com:5000
-export const PROXY_URL_REGEX = /^http:\/\/(([^:]+:)?[^@]*@)?[^.:@]+\.[^:]+:[\d]+?$/;
+export const PROXY_URL_REGEX = /^https?:\/\/(([^:]+:)?[^@]*@)?[^.:@]+\.[^:]+:[\d]+?$/;
 
 /**
  * AWS S3 docs say:
diff --git a/packages/input_schema/src/intl.ts b/packages/input_schema/src/intl.ts
index 166458640..45acdb4a0 100644
--- a/packages/input_schema/src/intl.ts
+++ b/packages/input_schema/src/intl.ts
@@ -21,7 +21,7 @@ const intlStrings = {
     'inputSchema.validation.proxyGroupsNotAvailable':
         'You currently do not have access to proxy groups: {groups}',
     'inputSchema.validation.customProxyInvalid':
-        'Proxy URL "{invalidUrl}" has invalid format, it must be http://[username[:password]]@hostname:port.',
+        'Proxy URL "{invalidUrl}" has invalid format, it must be http[s]://[username[:password]]@hostname:port.',
     'inputSchema.validation.apifyProxyCountryInvalid':
         'Country code "{invalidCountry}" is invalid. Only ISO 3166-1 alpha-2 country codes are supported.',
     'inputSchema.validation.apifyProxyCountryWithoutApifyProxyForbidden':
diff --git a/test/utilities.client.test.ts b/test/utilities.client.test.ts
index ab26db1cb..0f567fd9b 100644
--- a/test/utilities.client.test.ts
+++ b/test/utilities.client.test.ts
@@ -958,12 +958,12 @@ describe('utilities.client', () => {
             const proxy = null;
             const inputs = [
                 // Invalid
-                { field: { useApifyProxy: false, proxyUrls: ['https://asdasd:qweqe@proxy.apify.com:8000'] } }, // https
                 { field: { useApifyProxy: false, proxyUrls: ['http://asdasd:qweqe@proxy.apify.com'] } }, // missing port
                 { field: { useApifyProxy: false, proxyUrls: ['http://asdasd:qweqe@proxy.apify.com:8000/asd'] } }, // path after port
                 { field: { useApifyProxy: false, proxyUrls: ['http://asdasd@qweqe@proxy.apify.com:8000'] } }, // malformed url
                 { field: { useApifyProxy: false, proxyUrls: ['http://asdasd:qweqe:proxy.apify.com:8000'] } }, // malformed url
                 // Valid
+                { field: { useApifyProxy: false, proxyUrls: ['https://asdasd:qweqe@proxy.apify.com:8000'] } }, // https
                 { field: { useApifyProxy: false, proxyUrls: ['http://proxy.apify.com:8000'] } }, // without auth
                 { field: { useApifyProxy: false, proxyUrls: ['http://qweqe@proxy.apify.com:6000'] } }, // without password
                 { field: { useApifyProxy: false, proxyUrls: ['http://asd:qweqe@proxy.apify.com:55555'] } }, // with auth
@@ -974,7 +974,7 @@ describe('utilities.client', () => {
                 .filter((errors) => errors.length > 0);
 
             // There should be 5 invalid inputs
-            expect(results.length).toEqual(5);
+            expect(results.length).toEqual(4);
             results.forEach((result) => {
                 // Only one error should be thrown
                 expect(result.length).toEqual(1);