--- a/src/hotspot/cpu/zero/stack_zero.hpp
+++ b/src/hotspot/cpu/zero/stack_zero.hpp
@@ -97,7 +97,7 @@ class ZeroStack {
   int shadow_pages_size() const {
     return _shadow_pages_size;
   }
-  int abi_stack_available(Thread *thread) const;
+  ssize_t abi_stack_available(Thread *thread) const;
 
  public:
   void overflow_check(int required_words, TRAPS);
--- a/src/hotspot/cpu/zero/stack_zero.inline.hpp
+++ b/src/hotspot/cpu/zero/stack_zero.inline.hpp
@@ -46,11 +46,11 @@ inline void ZeroStack::overflow_check(int required_words, TRAPS) {
 // This method returns the amount of ABI stack available for us
 // to use under normal circumstances.  Note that the returned
 // value can be negative.
-inline int ZeroStack::abi_stack_available(Thread *thread) const {
+inline ssize_t ZeroStack::abi_stack_available(Thread *thread) const {
   assert(Thread::current() == thread, "should run in the same thread");
-  int stack_used = thread->stack_base() - (address) &stack_used
+  ssize_t stack_used = thread->stack_base() - (address) &stack_used
     + (StackOverflow::stack_guard_zone_size() + StackOverflow::stack_shadow_zone_size());
-  int stack_free = thread->stack_size() - stack_used;
+  ssize_t stack_free = thread->stack_size() - stack_used;
   return stack_free;
 }