diff --git openjdk.orig/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahUtils.cpp openjdk/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahUtils.cpp
--- openjdk.orig/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahUtils.cpp
+++ openjdk/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahUtils.cpp
@@ -150,5 +150,5 @@
     return value;
   }
 
-  return (size_t)1 << (log2_intptr(value) + 1);
+  return (size_t)1 << (log2_intptr((uintptr_t) value) + 1);
 }
diff --git openjdk.orig/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahNumberSeq.cpp openjdk/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahNumberSeq.cpp
--- openjdk.orig/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahNumberSeq.cpp
+++ openjdk/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahNumberSeq.cpp
@@ -135,7 +135,7 @@
 void BinaryMagnitudeSeq::add(size_t val) {
   Atomic::add(val, &_sum);
 
-  int mag = log2_intptr(val) + 1;
+  int mag = log2_intptr((uintptr_t)val) + 1;
 
   // Defensively saturate for product bits:
   if (mag < 0) {
diff --git openjdk.orig/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahHeap.cpp openjdk/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahHeap.cpp
--- openjdk.orig/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahHeap.cpp
+++ openjdk/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahHeap.cpp
@@ -659,7 +659,7 @@
 }
 
 size_t ShenandoahHeap::soft_max_capacity() const {
-  size_t v = OrderAccess::load_acquire((volatile size_t*)&_soft_max_size);
+  size_t v = OrderAccess::load_acquire((volatile jlong*)&_soft_max_size);
   assert(min_capacity() <= v && v <= max_capacity(),
          err_msg("Should be in bounds: " SIZE_FORMAT " <= " SIZE_FORMAT " <= " SIZE_FORMAT,
                  min_capacity(), v, max_capacity()));
diff --git openjdk.orig/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahHeap.hpp openjdk/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahHeap.hpp
--- openjdk.orig/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahHeap.hpp
+++ openjdk/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahHeap.hpp
@@ -155,7 +155,7 @@
 private:
            size_t _initial_size;
            size_t _minimum_size;
-  volatile size_t _soft_max_size;
+  volatile jlong  _soft_max_size;
   shenandoah_padding(0);
   volatile jlong  _used;
   volatile size_t _committed;