diff --git a/passbook/core/models.py b/passbook/core/models.py
index 1b4945c2e..9b1827454 100644
--- a/passbook/core/models.py
+++ b/passbook/core/models.py
@@ -160,7 +160,7 @@ class Application(PolicyBindingModel):
         if self.meta_launch_url:
             return self.meta_launch_url
         if self.provider:
-            return self.provider.launch_url
+            return self.get_provider().launch_url
         return None
 
     def get_provider(self) -> Optional[Provider]:
diff --git a/passbook/providers/oauth2/models.py b/passbook/providers/oauth2/models.py
index 8d904c83b..a12a25397 100644
--- a/passbook/providers/oauth2/models.py
+++ b/passbook/providers/oauth2/models.py
@@ -269,12 +269,11 @@ class OAuth2Provider(Provider):
     @property
     def launch_url(self) -> Optional[str]:
         """Guess launch_url based on first redirect_uri"""
-        if not self.redirect_uris:
+        if self.redirect_uris == "":
             return None
-        main_url = self.redirect_uris[0]
+        main_url = self.redirect_uris.split("\n")[0]
         launch_url = urlparse(main_url)
-        launch_url.path = ""
-        return launch_url.geturl()
+        return main_url.replace(launch_url.path, "")
 
     def form(self) -> Type[ModelForm]:
         from passbook.providers.oauth2.forms import OAuth2ProviderForm
diff --git a/passbook/providers/saml/models.py b/passbook/providers/saml/models.py
index 0a370bd75..5ec666d08 100644
--- a/passbook/providers/saml/models.py
+++ b/passbook/providers/saml/models.py
@@ -107,8 +107,7 @@ class SAMLProvider(Provider):
     def launch_url(self) -> Optional[str]:
         """Guess launch_url based on acs URL"""
         launch_url = urlparse(self.acs_url)
-        launch_url.path = ""
-        return launch_url.geturl()
+        return self.acs_url.replace(launch_url.path, "")
 
     def form(self) -> Type[ModelForm]:
         from passbook.providers.saml.forms import SAMLProviderForm