diff --git a/tests/ExtraTests/X94-ThreadSafetyTests.cpp b/tests/ExtraTests/X94-ThreadSafetyTests.cpp
index d992634d..b0ad38d9 100644
--- a/tests/ExtraTests/X94-ThreadSafetyTests.cpp
+++ b/tests/ExtraTests/X94-ThreadSafetyTests.cpp
@@ -25,7 +25,7 @@
 
 TEST_CASE( "Failed REQUIRE in the main thread is fine" ) {
     std::vector<std::thread> threads;
-    for ( size_t t = 0; t < 2; ++t) {
+    for ( size_t t = 0; t < 4; ++t) {
         threads.emplace_back( [t]() {
             CAPTURE(t);
             for (size_t i = 0; i < 1'000; ++i) {