diff --git a/src/aphront/storage/connection/mysql/AphrontMySQLDatabaseConnection.php b/src/aphront/storage/connection/mysql/AphrontMySQLDatabaseConnection.php
--- a/src/aphront/storage/connection/mysql/AphrontMySQLDatabaseConnection.php
+++ b/src/aphront/storage/connection/mysql/AphrontMySQLDatabaseConnection.php
@@ -72,7 +72,7 @@
       }
     }
 
-    $ok = mysql_set_charset('utf8mb4', $conn);
+    $ok = @mysql_set_charset('utf8mb4', $conn);
     if (!$ok) {
       mysql_set_charset('utf8', $conn);
     }
diff --git a/src/aphront/storage/connection/mysql/AphrontMySQLiDatabaseConnection.php b/src/aphront/storage/connection/mysql/AphrontMySQLiDatabaseConnection.php
--- a/src/aphront/storage/connection/mysql/AphrontMySQLiDatabaseConnection.php
+++ b/src/aphront/storage/connection/mysql/AphrontMySQLiDatabaseConnection.php
@@ -67,7 +67,7 @@
         "#{$errno}: {$error}.", $errno);
     }
 
-    $ok = $conn->set_charset('utf8mb4');
+    $ok = @$conn->set_charset('utf8mb4');
     if (!$ok) {
       $ok = $conn->set_charset('utf8');
     }