--- old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/HotSpotHostBackend.java	2017-12-13 08:52:36.000000000 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/HotSpotHostBackend.java	2017-12-13 08:52:35.000000000 -0800
@@ -45,6 +45,7 @@
 import jdk.vm.ci.common.InitTimer;
 import jdk.vm.ci.hotspot.HotSpotCallingConventionType;
 import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime;
+import jdk.vm.ci.meta.JavaKind;
 import jdk.vm.ci.meta.JavaType;
 import jdk.vm.ci.runtime.JVMCICompiler;
 
@@ -142,7 +143,8 @@
 
     @Override
     public ReferenceMapBuilder newReferenceMapBuilder(int totalFrameSize) {
-        return new HotSpotReferenceMapBuilder(totalFrameSize, config.maxOopMapStackOffset);
+        int uncompressedReferenceSize = getTarget().arch.getPlatformKind(JavaKind.Object).getSizeInBytes();
+        return new HotSpotReferenceMapBuilder(totalFrameSize, config.maxOopMapStackOffset, uncompressedReferenceSize);
     }
 
 }