diff --git a/snapshot/mac/process_reader_mac.h b/snapshot/mac/process_reader_mac.h
index 9435b057..9feb8b07 100644
--- a/snapshot/mac/process_reader_mac.h
+++ b/snapshot/mac/process_reader_mac.h
@@ -138,7 +138,7 @@ class ProcessReaderMac {
   bool CPUTimes(timeval* user_time, timeval* system_time) const;
 
   //! \return Accesses the memory of the target task.
-  ProcessMemoryMac* Memory() { return &process_memory_; }
+  const ProcessMemoryMac* Memory() const { return &process_memory_; }
 
   //! \return The threads that are in the task (process). The first element (at
   //!     index `0`) corresponds to the main thread.
diff --git a/snapshot/mac/process_snapshot_mac.cc b/snapshot/mac/process_snapshot_mac.cc
index 68837ff4..528e9213 100644
--- a/snapshot/mac/process_snapshot_mac.cc
+++ b/snapshot/mac/process_snapshot_mac.cc
@@ -219,8 +219,7 @@ std::vector<const MemorySnapshot*> ProcessSnapshotMac::ExtraMemory() const {
 
 const ProcessMemory* ProcessSnapshotMac::Memory() const {
   INITIALIZATION_STATE_DCHECK_VALID(initialized_);
-  NOTREACHED();  // https://crashpad.chromium.org/bug/263
-  return nullptr;
+  return process_reader_.Memory();
 }
 
 void ProcessSnapshotMac::InitializeThreads() {
diff --git a/snapshot/mac/process_types/custom.cc b/snapshot/mac/process_types/custom.cc
index 7a207e98..90209654 100644
--- a/snapshot/mac/process_types/custom.cc
+++ b/snapshot/mac/process_types/custom.cc
@@ -36,7 +36,7 @@ namespace internal {
 namespace {
 
 template <typename T>
-bool ReadIntoAndZero(ProcessMemoryMac* process_memory,
+bool ReadIntoAndZero(const ProcessMemoryMac* process_memory,
                      mach_vm_address_t address,
                      mach_vm_size_t size,
                      T* specific) {
@@ -84,7 +84,7 @@ bool ReadIntoVersioned(ProcessReaderMac* process_reader,
     return false;
   }
 
-  ProcessMemoryMac* process_memory = process_reader->Memory();
+  const ProcessMemoryMac* process_memory = process_reader->Memory();
   decltype(specific->version) version;
   if (!process_memory->Read(field_address, sizeof(version), &version)) {
     return false;
@@ -103,7 +103,7 @@ bool ReadIntoSized(ProcessReaderMac* process_reader,
     return false;
   }
 
-  ProcessMemoryMac* process_memory = process_reader->Memory();
+  const ProcessMemoryMac* process_memory = process_reader->Memory();
   decltype(specific->size) size;
   if (!process_memory->Read(address + offsetof(T, size), sizeof(size), &size)) {
     return false;