--- a/src/hotspot/share/gc/shared/gcConfig.cpp	Wed May 22 13:05:37 2019 +0200
+++ b/src/hotspot/share/gc/shared/gcConfig.cpp	Wed May 22 13:06:31 2019 +0200
@@ -109,15 +109,15 @@
 void GCConfig::select_gc_ergonomically() {
   if (os::is_server_class_machine()) {
 #if INCLUDE_G1GC
-    FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
+    FLAG_SET_ERGO_IF_DEFAULT(UseG1GC, true);
 #elif INCLUDE_PARALLELGC
-    FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true);
+    FLAG_SET_ERGO_IF_DEFAULT(UseParallelGC, true);
 #elif INCLUDE_SERIALGC
-    FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
+    FLAG_SET_ERGO_IF_DEFAULT(UseSerialGC, true);
 #endif
   } else {
 #if INCLUDE_SERIALGC
-    FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
+    FLAG_SET_ERGO_IF_DEFAULT(UseSerialGC, true);
 #endif
   }
 }