diff --git a/src/client/Client.cc b/src/client/Client.cc
index 9de38063c9c..a2367cb0f7a 100644
--- a/src/client/Client.cc
+++ b/src/client/Client.cc
@@ -63,7 +63,7 @@ using namespace std;
 
 #define DOUT_SUBSYS client
 #undef dout_prefix
-#define dout_prefix *_dout << dbeginl << pthread_self() << " client" << whoami << " "
+#define dout_prefix *_dout << dbeginl << std::hex << pthread_self() << std::dec << " client" << whoami << " "
 
 #define  tout       if (g_conf.client_trace) traceout
 
diff --git a/src/common/Mutex.cc b/src/common/Mutex.cc
index 13d3ee8dff8..0d0b1589082 100644
--- a/src/common/Mutex.cc
+++ b/src/common/Mutex.cc
@@ -15,8 +15,8 @@ int g_lockdep = 0;
 
 #undef dout
 #undef derr
-#define  dout(l)    if (l<=g_conf.debug_lockdep) *_dout << g_clock.now() << " " << pthread_self() << " lockdep: "
-#define  derr(l)    if (l<=g_conf.debug_lockdep) *_derr << g_clock.now() << " " << pthread_self() << " lockdep: "
+#define  dout(l)    if (l<=g_conf.debug_lockdep) *_dout << g_clock.now() << " " << std::hex << pthread_self() << std::dec << " lockdep: "
+#define  derr(l)    if (l<=g_conf.debug_lockdep) *_derr << g_clock.now() << " " << std::hex << pthread_self() << std::dec << " lockdep: "
 
 
 pthread_mutex_t lockdep_mutex = PTHREAD_MUTEX_INITIALIZER;
diff --git a/src/common/WorkQueue.cc b/src/common/WorkQueue.cc
index a349f2df21a..40f17e3c346 100644
--- a/src/common/WorkQueue.cc
+++ b/src/common/WorkQueue.cc
@@ -19,7 +19,7 @@
 
 #define DOUT_SUBSYS tp
 #undef dout_prefix
-#define dout_prefix *_dout << dbeginl << pthread_self() << " " << name << " "
+#define dout_prefix *_dout << dbeginl << std::hex << pthread_self() << std::dec << " " << name << " "
 
 
 void ThreadPool::worker()
diff --git a/src/common/lockdep.cc b/src/common/lockdep.cc
index 93829cd7e8c..8b37dc18dd8 100644
--- a/src/common/lockdep.cc
+++ b/src/common/lockdep.cc
@@ -10,7 +10,7 @@
 #include "config.h"
 
 #undef dout
-#define  dout(l)    if (l<=g_conf.debug_lockdep) *_dout << g_clock.now() << " " << pthread_self() << " lockdep: "
+#define  dout(l)    if (l<=g_conf.debug_lockdep) *_dout << g_clock.now() << " " << std::hex << pthread_self() << std::dec << " lockdep: "
 
 
 // global
diff --git a/src/common/tls.cc b/src/common/tls.cc
index f272dabcd8f..3c6f9c76b9f 100644
--- a/src/common/tls.cc
+++ b/src/common/tls.cc
@@ -8,8 +8,8 @@
 
 #undef dout
 #undef derr
-#define  dout(l)    if (l<=g_conf.debug_lockdep) *_dout << g_clock.now() << " " << pthread_self() << " tls: "
-#define  derr(l)    if (l<=g_conf.debug_lockdep) *_derr << g_clock.now() << " " << pthread_self() << " tls: "
+#define  dout(l)    if (l<=g_conf.debug_lockdep) *_dout << g_clock.now() << " " << std::hex << pthread_self() << std::dec << " tls: "
+#define  derr(l)    if (l<=g_conf.debug_lockdep) *_derr << g_clock.now() << " " << std::hex << pthread_self() << std::dec << " tls: "
 
 
 pthread_key_t   _tls_key = 0;
diff --git a/src/msg/SimpleMessenger.cc b/src/msg/SimpleMessenger.cc
index 812b50e9d92..9920a6ff690 100644
--- a/src/msg/SimpleMessenger.cc
+++ b/src/msg/SimpleMessenger.cc
@@ -40,7 +40,7 @@
 #undef dout_prefix
 #define dout_prefix _prefix(messenger)
 static ostream& _prefix(SimpleMessenger *messenger) {
-  return *_dout << dbeginl << pthread_self() << " -- " << messenger->ms_addr << " ";
+  return *_dout << dbeginl << std::hex << pthread_self() << std::dec << " -- " << messenger->ms_addr << " ";
 }
 
 
@@ -465,7 +465,7 @@ entity_addr_t SimpleMessenger::get_myaddr()
 #undef dout_prefix
 #define dout_prefix _pipe_prefix()
 ostream& SimpleMessenger::Pipe::_pipe_prefix() {
-  return *_dout << dbeginl << pthread_self()
+  return *_dout << dbeginl << std::hex << pthread_self() << std::dec
 		<< " -- " << messenger->ms_addr << " >> " << peer_addr << " pipe(" << this
 		<< " sd=" << sd
 		<< " pgs=" << peer_global_seq
diff --git a/src/os/FileJournal.cc b/src/os/FileJournal.cc
index 9b6c50c74a1..48b1ba3b90e 100644
--- a/src/os/FileJournal.cc
+++ b/src/os/FileJournal.cc
@@ -24,7 +24,7 @@
 
 #define DOUT_SUBSYS journal
 #undef dout_prefix
-#define dout_prefix *_dout << dbeginl << pthread_self() << " journal "
+#define dout_prefix *_dout << dbeginl << std::hex << pthread_self() << std::dec << " journal "
 
 
 int FileJournal::_open(bool forwrite, bool create)
diff --git a/src/os/FileStore.cc b/src/os/FileStore.cc
index 9c73d838740..7ca992c596f 100644
--- a/src/os/FileStore.cc
+++ b/src/os/FileStore.cc
@@ -62,7 +62,7 @@
 
 #define DOUT_SUBSYS filestore
 #undef dout_prefix
-#define dout_prefix *_dout << dbeginl << pthread_self() << " filestore(" << basedir << ") "
+#define dout_prefix *_dout << dbeginl << std::hex << pthread_self() << std::dec << " filestore(" << basedir << ") "
 
 #include "include/buffer.h"
 
diff --git a/src/osd/OSD.cc b/src/osd/OSD.cc
index 2e6ef3a6106..35940f53a80 100644
--- a/src/osd/OSD.cc
+++ b/src/osd/OSD.cc
@@ -99,7 +99,7 @@
 #define dout_prefix _prefix(*_dout, whoami, osdmap)
 
 static ostream& _prefix(ostream& out, int whoami, OSDMap *osdmap) {
-  return out << dbeginl << pthread_self()
+  return out << dbeginl << std::hex << pthread_self() << std::dec
 	     << " osd" << whoami << " " << (osdmap ? osdmap->get_epoch():0) << " ";
 }
 
diff --git a/src/osd/PG.cc b/src/osd/PG.cc
index b2081fb9c22..ad9f2608f34 100644
--- a/src/osd/PG.cc
+++ b/src/osd/PG.cc
@@ -36,7 +36,7 @@
 #undef dout_prefix
 #define dout_prefix _prefix(this, osd->whoami, osd->osdmap)
 static ostream& _prefix(PG *pg, int whoami, OSDMap *osdmap) {
-  return *_dout << dbeginl<< pthread_self() << " osd" << whoami << " " << (osdmap ? osdmap->get_epoch():0) << " " << *pg << " ";
+  return *_dout << dbeginl<< std::hex << pthread_self() << std::dec << " osd" << whoami << " " << (osdmap ? osdmap->get_epoch():0) << " " << *pg << " ";
 }
 
 
diff --git a/src/osd/RAID4PG.cc b/src/osd/RAID4PG.cc
index 1ca57352f6d..9f49a6fb30c 100644
--- a/src/osd/RAID4PG.cc
+++ b/src/osd/RAID4PG.cc
@@ -28,7 +28,7 @@
 #undef dout_prefix
 #define dout_prefix _prefix(this, osd->whoami, osd->osdmap)
 static ostream& _prefix(PG *pg, int whoami, OSDMap *osdmap) {
-  return *_dout << dbeginl << pthread_self()
+  return *_dout << dbeginl << std::hex << pthread_self() << std::dec
 		<< " osd" << whoami 
 		<< " " << (osdmap ? osdmap->get_epoch():0) << " "
 		<< *pg << " ";
diff --git a/src/osd/ReplicatedPG.cc b/src/osd/ReplicatedPG.cc
index 99f92b2153b..60513ddf788 100644
--- a/src/osd/ReplicatedPG.cc
+++ b/src/osd/ReplicatedPG.cc
@@ -38,7 +38,7 @@
 #undef dout_prefix
 #define dout_prefix _prefix(this, osd->whoami, osd->osdmap)
 static ostream& _prefix(PG *pg, int whoami, OSDMap *osdmap) {
-  return *_dout << dbeginl << pthread_self() << " osd" << whoami
+  return *_dout << dbeginl << std::hex << pthread_self() << std::dec << " osd" << whoami
 		<< " " << (osdmap ? osdmap->get_epoch():0) << " " << *pg << " ";
 }