diff --git a/gtk2_ardour/ardour_ui_ed.cc b/gtk2_ardour/ardour_ui_ed.cc
index cf8fd19ba4..b0ad3ca3a4 100644
--- a/gtk2_ardour/ardour_ui_ed.cc
+++ b/gtk2_ardour/ardour_ui_ed.cc
@@ -49,7 +49,7 @@
 #include "ardour/audioengine.h"
 #include "ardour/control_protocol_manager.h"
 
-#include <control_protocol/control_protocol.h>
+#include "control_protocol/control_protocol.h"
 
 #include "i18n.h"
 
diff --git a/gtk2_ardour/editor.cc b/gtk2_ardour/editor.cc
index 2062a426a9..83a0d7428a 100644
--- a/gtk2_ardour/editor.cc
+++ b/gtk2_ardour/editor.cc
@@ -61,7 +61,7 @@
 #include "ardour/tempo.h"
 #include "ardour/utils.h"
 
-#include <control_protocol/control_protocol.h>
+#include "control_protocol/control_protocol.h"
 
 #include "ardour_ui.h"
 #include "editor.h"
diff --git a/libs/ardour/ardour/types.h b/libs/ardour/ardour/types.h
index 09ccf15624..b6b6321d4f 100644
--- a/libs/ardour/ardour/types.h
+++ b/libs/ardour/ardour/types.h
@@ -31,7 +31,7 @@
 #include <inttypes.h>
 #include <jack/types.h>
 #include <jack/midiport.h>
-#include <control_protocol/smpte.h>
+#include "control_protocol/smpte.h"
 #include "pbd/id.h"
 
 #include <map>
diff --git a/libs/ardour/control_protocol_manager.cc b/libs/ardour/control_protocol_manager.cc
index 9ac0b360f9..90d8198ec4 100644
--- a/libs/ardour/control_protocol_manager.cc
+++ b/libs/ardour/control_protocol_manager.cc
@@ -23,7 +23,7 @@
 #include "pbd/file_utils.h"
 #include "pbd/error.h"
 
-#include <control_protocol/control_protocol.h>
+#include "control_protocol/control_protocol.h"
 
 #include "ardour/session.h"
 #include "ardour/control_protocol_manager.h"
diff --git a/libs/ardour/session_feedback.cc b/libs/ardour/session_feedback.cc
index 19fbbe1424..e6d1086126 100644
--- a/libs/ardour/session_feedback.cc
+++ b/libs/ardour/session_feedback.cc
@@ -37,7 +37,7 @@
 #include "ardour/session.h"
 #include "ardour/audio_track.h"
 #include "ardour/audio_diskstream.h"
-#include <control_protocol/control_protocol.h>
+#include "control_protocol/control_protocol.h"
 
 #include "i18n.h"
 
diff --git a/libs/ardour/session_state.cc b/libs/ardour/session_state.cc
index 4680a84288..e04333a2fa 100644
--- a/libs/ardour/session_state.cc
+++ b/libs/ardour/session_state.cc
@@ -105,7 +105,7 @@
 #include "ardour/ticker.h"
 #include "ardour/route_group.h"
 
-#include <control_protocol/control_protocol.h>
+#include "control_protocol/control_protocol.h"
 
 #include "i18n.h"
 #include <locale.h>