diff --git a/gtk2_ardour/pianoroll_automation_line.h b/gtk2_ardour/pianoroll_automation_line.h
index 7dee3fb4c6..d0f8518393 100644
--- a/gtk2_ardour/pianoroll_automation_line.h
+++ b/gtk2_ardour/pianoroll_automation_line.h
@@ -16,8 +16,8 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#ifndef __gtk2_ardour_pianoroll_automation_line.h__
-#define __gtk2_ardour_pianoroll_automation_line.h__
+#ifndef __gtk2_ardour_pianoroll_automation_line_h__
+#define __gtk2_ardour_pianoroll_automation_line_h__
 
 #include "automation_line.h"
 
diff --git a/gtk2_ardour/pianoroll_background.h b/gtk2_ardour/pianoroll_background.h
index 5651b9b837..bb8e0a2388 100644
--- a/gtk2_ardour/pianoroll_background.h
+++ b/gtk2_ardour/pianoroll_background.h
@@ -20,8 +20,8 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#ifndef __gtk2_ardour_pianoroll_background.h__
-#define __gtk2_ardour_pianoroll_background.h__
+#ifndef __gtk2_ardour_pianoroll_background_h__
+#define __gtk2_ardour_pianoroll_background_h__
 
 #include <cstdint>
 
@@ -59,4 +59,4 @@ class CueMidiBackground : public MidiViewBackground
 };
 
 
-#endif /* __gtk2_ardour_pianoroll_background.h__ */
+#endif /* __gtk2_ardour_pianoroll_background_h__ */
diff --git a/gtk2_ardour/pianoroll_velocity.h b/gtk2_ardour/pianoroll_velocity.h
index 6934737d10..d965e76be9 100644
--- a/gtk2_ardour/pianoroll_velocity.h
+++ b/gtk2_ardour/pianoroll_velocity.h
@@ -16,8 +16,8 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#ifndef __gtk2_ardour_pianoroll_velocity.h__
-#define __gtk2_ardour_pianoroll_velocity.h__
+#ifndef __gtk2_ardour_pianoroll_velocity_h__
+#define __gtk2_ardour_pianoroll_velocity_h__
 
 #include "ghost_event.h"
 #include "velocity_display.h"
@@ -40,4 +40,4 @@ class PianorollVelocityDisplay : public VelocityDisplay
 	bool lollevent (GdkEvent*, GhostEvent*);
 };
 
-#endif /* __gtk2_ardour_pianoroll_velocity.h__ */
+#endif /* __gtk2_ardour_pianoroll_velocity_h__ */