diff --git a/src/applications/diffusion/typeahead/DiffusionRepositoryDatasource.php b/src/applications/diffusion/typeahead/DiffusionRepositoryDatasource.php
--- a/src/applications/diffusion/typeahead/DiffusionRepositoryDatasource.php
+++ b/src/applications/diffusion/typeahead/DiffusionRepositoryDatasource.php
@@ -41,7 +41,7 @@
       $parts[] = $name;
 
       $slug = $repository->getRepositorySlug();
-      if (strlen($slug)) {
+      if (phutil_nonempty_string($slug)) {
         $parts[] = $slug;
       }
 
diff --git a/src/applications/repository/storage/PhabricatorRepository.php b/src/applications/repository/storage/PhabricatorRepository.php
--- a/src/applications/repository/storage/PhabricatorRepository.php
+++ b/src/applications/repository/storage/PhabricatorRepository.php
@@ -217,7 +217,7 @@
     $monograms[] = 'R'.$this->getID();
 
     $callsign = $this->getCallsign();
-    if (strlen($callsign)) {
+    if (phutil_nonempty_string($callsign)) {
       $monograms[] = 'r'.$callsign;
     }