diff --git a/src/common/mac/MachIPC.h b/src/common/mac/MachIPC.h
--- a/src/common/mac/MachIPC.h
+++ b/src/common/mac/MachIPC.h
@@ -90,18 +90,20 @@
 //
 //    char messageString[] = "Hello server!\n";
 //    message.SetData(messageString, strlen(messageString)+1);
 //
 //    kern_return_t result = sender.SendMessage(message, 1000); // timeout 1000ms
 //
 
 namespace google_breakpad {
+#ifndef PRINT_MACH_RESULT
 #define PRINT_MACH_RESULT(result_, message_) \
   printf(message_" %s (%d)\n", mach_error_string(result_), result_ );
+#endif
 
 //==============================================================================
 // A wrapper class for mach_msg_port_descriptor_t (with same memory layout)
 // with convenient constructors and accessors
 class MachMsgPortDescriptor : public mach_msg_port_descriptor_t {
  public:
   // General-purpose constructor
   MachMsgPortDescriptor(mach_port_t in_name,