diff --git a/src/bitboard.c b/src/bitboard.c
index 637b953..85993bc 100644
--- a/src/bitboard.c
+++ b/src/bitboard.c
@@ -14,7 +14,7 @@
 #include <stdio.h>
 #include <stdarg.h>
 
-#include "brlib.h"
+#include <brlib.h>
 
 #include "chessdefs.h"
 #include "piece.h"
diff --git a/src/board.h b/src/board.h
index b10a35c..1c45350 100644
--- a/src/board.h
+++ b/src/board.h
@@ -14,7 +14,7 @@
 #ifndef _BOARD_H
 #define _BOARD_H
 
-#include "brlib.h"
+#include <brlib.h>
 
 #include "chessdefs.h"
 #include "piece.h"
diff --git a/src/chessdefs.h b/src/chessdefs.h
index 03658d5..e07eb93 100644
--- a/src/chessdefs.h
+++ b/src/chessdefs.h
@@ -14,7 +14,7 @@
 #ifndef _CHESSDEFS_H
 #define _CHESSDEFS_H
 
-#include "brlib.h"                                /* brlib types */
+#include <brlib.h>                                /* brlib types */
 
 #define ONE                1ul
 #define U64(const_u64)     const_u64##UL
diff --git a/src/hyperbola-quintessence.c b/src/hyperbola-quintessence.c
index 7bd1ec8..cb11501 100644
--- a/src/hyperbola-quintessence.c
+++ b/src/hyperbola-quintessence.c
@@ -14,7 +14,7 @@
 #include <stdio.h>
 #include <stdarg.h>
 
-#include "brlib.h"
+#include <brlib.h>
 
 #include "chessdefs.h"
 #include "board.h"
diff --git a/src/move-do.c b/src/move-do.c
index 7f36bf7..7fdc740 100644
--- a/src/move-do.c
+++ b/src/move-do.c
@@ -15,9 +15,9 @@
 #include <ctype.h>
 #include <stdlib.h>
 
-#include "brlib.h"
-#include "likely.h"
-#include "bug.h"
+#include <brlib.h>
+#include <likely.h>
+#include <bug.h>
 
 #include "chessdefs.h"
 #include "move.h"