diff --git a/core/tests/unit/kmx/kmx.tests.cpp b/core/tests/unit/kmx/kmx.tests.cpp
index 653ac88344..200e4cf1b0 100644
--- a/core/tests/unit/kmx/kmx.tests.cpp
+++ b/core/tests/unit/kmx/kmx.tests.cpp
@@ -153,7 +153,7 @@ apply_action(
     std::cout << "action: emit keystroke" << std::endl;
     break;
   case KM_CORE_IT_CAPSLOCK:
-    std::cout << "action: capsLock " << act.capsLock << std::endl;
+    std::cout << "action: capsLock " << std::to_string(act.capsLock) << std::endl;
     test_source.set_caps_lock_on(act.capsLock);
     break;
   default:
diff --git a/core/tests/unit/ldml/ldml.tests.cpp b/core/tests/unit/ldml/ldml.tests.cpp
index 6ded17d58e..35099ac7d6 100644
--- a/core/tests/unit/ldml/ldml.tests.cpp
+++ b/core/tests/unit/ldml/ldml.tests.cpp
@@ -112,7 +112,7 @@ apply_action(
     break;
   case KM_CORE_IT_BACK:
   {
-    std::cout << "  + back(" << act.backspace.expected_type << ")" << std::endl;
+    std::cout << "  + back(" << std::to_string(act.backspace.expected_type) << ")" << std::endl;
 
     // single char removed in context
     km_core_usv ch = 0;