diff --git a/source/common.h b/source/common.h
index 07c3b496a..5cd466ec5 100644
--- a/source/common.h
+++ b/source/common.h
@@ -533,7 +533,9 @@ auto contains(
 
 
 //  Print an integer with 1,000's separators (always commas, not locale-driven)
-auto print_with_thousands(std::integral auto val)
+template <typename T>
+    requires std::is_integral_v<T>  // Note: `std::integral` concept not yet available in Apple Clang
+auto print_with_thousands(T val)
     -> std::string
 {
     auto ret = std::to_string(val % 10);