diff --git a/support/init/init-script.php b/support/init/init-script.php
--- a/support/init/init-script.php
+++ b/support/init/init-script.php
@@ -50,6 +50,12 @@
     // See T13296. On macOS under PHP 7.3.x, PCRE currently segfaults after
     // "fork()" if "pcre.jit" is enabled.
     'pcre.jit' => 0,
+
+    // See PHI1894. This option was introduced in PHP 7.4, and removes the
+    // "args" value from exception backtraces. We have some unit tests which
+    // inspect "args", and this option generally obscures useful debugging
+    // information without any benefit in the context of Phabricator.
+    'zend.exception_ignore_args' => 0,
   );
 
   foreach ($config_map as $config_key => $config_value) {