diff --git a/action.cpp b/action.cpp
index 3c6a61a..a16e499 100644
--- a/action.cpp
+++ b/action.cpp
@@ -2570,7 +2570,7 @@ static DescAction action_table[] =
 // Calcule l'action suivante.
 // Retourne FALSE lorsque l'action est terminée.
 
-BOOL Action(short action, short direct,
+bool Action(short action, short direct,
 			short &phase, short &step,
 			short &channel, short &icon, POINT &pos, short &posZ,
 			short &sound)
@@ -2658,7 +2658,7 @@ static short rotate_table[] =
 
 // Tourne une icône dans une direction donnée.
 
-BOOL Rotate(short &icon, short direct)
+bool Rotate(short &icon, short direct)
 {
 	short*		pTable = rotate_table;
 	short		i;
diff --git a/action.h b/action.h
index af9e219..4205fbc 100644
--- a/action.h
+++ b/action.h
@@ -4,13 +4,13 @@
 #pragma once
 
 extern
-BOOL Action(short action, short direct,
+bool Action(short action, short direct,
 			short &phase, short &step,
 			short &channel, short &icon, POINT &pos, short &posZ,
 			short &sound);
 
 extern
-BOOL Rotate(short &icon, short direct);
+bool Rotate(short &icon, short direct);
 
 extern
 int GetIconDirect(short icon);