diff --git a/internal/mailer/templatemailer/templatemailer.go b/internal/mailer/templatemailer/templatemailer.go
index bd70476c6..3f5771c3f 100644
--- a/internal/mailer/templatemailer/templatemailer.go
+++ b/internal/mailer/templatemailer/templatemailer.go
@@ -502,7 +502,14 @@ func getPath(filepath string, params *emailParams) (*url.URL, error) {
 		}
 	}
 	if params != nil {
-		path.RawQuery = fmt.Sprintf("token=%s&type=%s&redirect_to=%s", url.QueryEscape(params.Token), url.QueryEscape(params.Type), encodeRedirectURL(params.RedirectTo))
+		baseQuery := fmt.Sprintf("token=%s&type=%s&redirect_to=%s", url.QueryEscape(params.Token), url.QueryEscape(params.Type), encodeRedirectURL(params.RedirectTo))
+
+		// Append existing query params if any
+		if existing := path.RawQuery; existing != "" {
+			path.RawQuery = fmt.Sprintf("%s&%s", baseQuery, existing)
+		} else {
+			path.RawQuery = baseQuery
+		}
 	}
 	return path, nil
 }
diff --git a/internal/mailer/templatemailer/templatemailer_url_test.go b/internal/mailer/templatemailer/templatemailer_url_test.go
index 672d37130..074013cb1 100644
--- a/internal/mailer/templatemailer/templatemailer_url_test.go
+++ b/internal/mailer/templatemailer/templatemailer_url_test.go
@@ -56,6 +56,12 @@ func TestGetPath(t *testing.T) {
 			Params:   &params,
 			Expected: "https://test.example.com?token=token&type=signup&redirect_to=https://example.com",
 		},
+		{
+			SiteURL:  "https://test.example.com/",
+			Path:     "/trailingslash?flow=test",
+			Params:   &params,
+			Expected: "https://test.example.com/trailingslash?token=token&type=signup&redirect_to=https://example.com&flow=test",
+		},
 	}
 
 	for _, c := range cases {