diff --git a/app/assets/javascripts/admin/addon/controllers/modals/admin-install-theme.js b/app/assets/javascripts/admin/addon/controllers/modals/admin-install-theme.js
index fbef0029c60..de735c98585 100644
--- a/app/assets/javascripts/admin/addon/controllers/modals/admin-install-theme.js
+++ b/app/assets/javascripts/admin/addon/controllers/modals/admin-install-theme.js
@@ -24,7 +24,7 @@ export default Controller.extend(ModalFunctionality, {
   keyGenUrl: "/admin/themes/generate_key_pair",
   importUrl: "/admin/themes/import",
   recordType: "theme",
-  checkPrivate: match("uploadUrl", /^git/),
+  checkPrivate: match("uploadUrl", /^.*[@].*[:].*\.git$/),
   localFile: null,
   uploadUrl: null,
   uploadName: null,
diff --git a/app/assets/javascripts/admin/tests/admin/acceptance/admin-install-theme-modal-test.js b/app/assets/javascripts/admin/tests/admin/acceptance/admin-install-theme-modal-test.js
index f2fdfbe7a57..cee0b244df8 100644
--- a/app/assets/javascripts/admin/tests/admin/acceptance/admin-install-theme-modal-test.js
+++ b/app/assets/javascripts/admin/tests/admin/acceptance/admin-install-theme-modal-test.js
@@ -9,6 +9,7 @@ acceptance("Admin - Themes - Install modal", function (needs) {
     const urlInput = ".install-theme-content .repo input";
     const branchInput = ".install-theme-content .branch input";
     const privateRepoCheckbox = ".install-theme-content .check-private input";
+    const publicKey = ".install-theme-content .public-key textarea";
 
     const themeUrl = "git@github.com:discourse/discourse.git";
     await visit("/admin/customize/themes");
@@ -29,6 +30,7 @@ acceptance("Admin - Themes - Install modal", function (needs) {
       query(privateRepoCheckbox).checked,
       "private repo checkbox is checked"
     );
+    assert.ok(query(publicKey), "shows public key");
 
     await click(".modal-footer .d-modal-cancel");
 
@@ -40,6 +42,33 @@ acceptance("Admin - Themes - Install modal", function (needs) {
       !query(privateRepoCheckbox).checked,
       "private repo checkbox unchecked"
     );
+    assert.notOk(query(publicKey), "hide public key");
+  });
+
+  test("show public key for valid ssh theme urls", async function (assert) {
+    const urlInput = ".install-theme-content .repo input";
+    const privateRepoCheckbox = ".install-theme-content .check-private input";
+    const publicKey = ".install-theme-content .public-key textarea";
+
+    // Supports backlog repo ssh url format
+    const themeUrl =
+      "discourse@discourse.git.backlog.com:/TEST_THEME/test-theme.git";
+    await visit("/admin/customize/themes");
+
+    await click(".create-actions .btn-primary");
+    await click("#remote");
+    await fillIn(urlInput, themeUrl);
+    await click(".install-theme-content .inputs .advanced-repo");
+    await click(privateRepoCheckbox);
+    assert.equal(query(urlInput).value, themeUrl, "url input is filled");
+    assert.ok(
+      query(privateRepoCheckbox).checked,
+      "private repo checkbox is checked"
+    );
+    assert.ok(query(publicKey), "shows public key");
+
+    await fillIn(urlInput, "https://github.com/discourse/discourse.git");
+    assert.notOk(query(publicKey), "does not shows public key for https urls");
   });
 
   test("modal can be auto-opened with the right query params", async function (assert) {