--- a/src/hotspot/share/gc/g1/g1Allocator.cpp	Fri Nov 22 10:03:38 2019 +0100
+++ b/src/hotspot/share/gc/g1/g1Allocator.cpp	Fri Nov 22 10:03:38 2019 +0100
@@ -194,7 +194,7 @@
   if (hr == NULL) {
     return max_tlab;
   } else {
-    return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab);
+    return clamp(hr->free(), MinTLABSize, max_tlab);
   }
 }