diff --git a/src/infrastructure/diff/view/PHUIDiffTableOfContentsItemView.php b/src/infrastructure/diff/view/PHUIDiffTableOfContentsItemView.php
--- a/src/infrastructure/diff/view/PHUIDiffTableOfContentsItemView.php
+++ b/src/infrastructure/diff/view/PHUIDiffTableOfContentsItemView.php
@@ -139,7 +139,7 @@
     $not_applicable = '-';
 
     $coverage = $this->getCoverage();
-    if (!strlen($coverage)) {
+    if (!phutil_nonempty_string($coverage)) {
       return $not_applicable;
     }
 
@@ -157,7 +157,7 @@
     $not_applicable = '-';
 
     $coverage = $this->getCoverage();
-    if (!strlen($coverage)) {
+    if (!phutil_nonempty_string($coverage)) {
       return $not_applicable;
     }