diff --git a/lldb/source/Plugins/ScriptInterpreter/Python/ScriptedProcessPythonInterface.h b/lldb/source/Plugins/ScriptInterpreter/Python/ScriptedProcessPythonInterface.h
--- a/lldb/source/Plugins/ScriptInterpreter/Python/ScriptedProcessPythonInterface.h
+++ b/lldb/source/Plugins/ScriptInterpreter/Python/ScriptedProcessPythonInterface.h
@@ -51,7 +51,7 @@
   bool IsAlive() override;
 
 protected:
-  size_t GetGenericInteger(llvm::StringRef method_name);
+  unsigned long long GetGenericInteger(llvm::StringRef method_name);
   Status GetStatusFromMethod(llvm::StringRef method_name);
 
 private:
diff --git a/lldb/source/Plugins/ScriptInterpreter/Python/ScriptedProcessPythonInterface.cpp b/lldb/source/Plugins/ScriptInterpreter/Python/ScriptedProcessPythonInterface.cpp
--- a/lldb/source/Plugins/ScriptInterpreter/Python/ScriptedProcessPythonInterface.cpp
+++ b/lldb/source/Plugins/ScriptInterpreter/Python/ScriptedProcessPythonInterface.cpp
@@ -63,7 +63,7 @@
 }
 
 bool ScriptedProcessPythonInterface::ShouldStop() {
-  return GetGenericInteger("shuold_stop");
+  return static_cast<bool>(GetGenericInteger("shuold_stop"));
 }
 
 Status ScriptedProcessPythonInterface::Stop() {
@@ -134,21 +134,24 @@
   return Status("Returned object is null.");
 }
 
-size_t
+unsigned long long
 ScriptedProcessPythonInterface::GetGenericInteger(llvm::StringRef method_name) {
   Locker py_lock(&m_interpreter, Locker::AcquireLock | Locker::NoSTDIN,
                  Locker::FreeLock);
 
+  unsigned long long invalid_address =
+      std::numeric_limits<unsigned long long>::max();
+
   if (!m_object_instance_sp)
-    return LLDB_INVALID_ADDRESS;
+    return invalid_address;
 
   if (!m_object_instance_sp)
-    return LLDB_INVALID_ADDRESS;
+    return invalid_address;
   PythonObject implementor(PyRefType::Borrowed,
                            (PyObject *)m_object_instance_sp->GetValue());
 
   if (!implementor.IsAllocated())
-    return LLDB_INVALID_ADDRESS;
+    return invalid_address;
 
   PythonObject pmeth(
       PyRefType::Owned,
@@ -158,12 +161,12 @@
     PyErr_Clear();
 
   if (!pmeth.IsAllocated())
-    return LLDB_INVALID_ADDRESS;
+    return invalid_address;
 
   if (PyCallable_Check(pmeth.get()) == 0) {
     if (PyErr_Occurred())
       PyErr_Clear();
-    return LLDB_INVALID_ADDRESS;
+    return invalid_address;
   }
 
   if (PyErr_Occurred())
@@ -181,9 +184,9 @@
 
   if (py_return.get()) {
     auto size = py_return.AsUnsignedLongLong();
-    return (size) ? *size : LLDB_INVALID_ADDRESS;
+    return (size) ? *size : invalid_address;
   }
-  return LLDB_INVALID_ADDRESS;
+  return invalid_address;
 }
 
 lldb::MemoryRegionInfoSP
@@ -280,7 +283,7 @@
 }
 
 lldb::pid_t ScriptedProcessPythonInterface::GetProcessID() {
-  size_t pid = GetGenericInteger("get_process_id");
+  unsigned long long pid = GetGenericInteger("get_process_id");
 
   return (pid >= std::numeric_limits<lldb::pid_t>::max())
              ? LLDB_INVALID_PROCESS_ID
@@ -288,7 +291,7 @@
 }
 
 bool ScriptedProcessPythonInterface::IsAlive() {
-  return GetGenericInteger("is_alive");
+  return static_cast<bool>(GetGenericInteger("is_alive"));
 }
 
 #endif