diff --git a/tests/src/TestHelpers.hpp b/tests/src/TestHelpers.hpp
index 1628915aa56..30d1f3b30a1 100644
--- a/tests/src/TestHelpers.hpp
+++ b/tests/src/TestHelpers.hpp
@@ -1,6 +1,11 @@
 #pragma once
 
-#include <ostream>
+// Include guard for some compilers not supporting `#pragma once` for prepended
+// includes.
+#ifndef TEST_HELPERS_HPP_INCLUDED
+#    define TEST_HELPERS_HPP_INCLUDED
+
+#    include <ostream>
 
 // This file is included in all TUs in chatterino-test to avoid ODR violations.
 //
@@ -20,3 +25,5 @@ void PrintTo(const QByteArray &bytes, std::ostream *os);
 void PrintTo(QStringView str, std::ostream *os);
 void PrintTo(const QString &str, std::ostream *os);
 // NOLINTEND(readability-identifier-naming)
+
+#endif
diff --git a/tools/crash-handler b/tools/crash-handler
index 9753fe80271..78935cd810e 160000
--- a/tools/crash-handler
+++ b/tools/crash-handler
@@ -1 +1 @@
-Subproject commit 9753fe802710b2df00f2287ec2e1ca78c251d085
+Subproject commit 78935cd810e7e951dd6efbd5711993ceb4d1674e