diff --git a/src/attack.c b/src/attack.c
index 0a8e583..fc73462 100644
--- a/src/attack.c
+++ b/src/attack.c
@@ -17,7 +17,7 @@
 #include "chessdefs.h"
 #include "bitboard.h"
 #include "position.h"
-#include "hyperbola-quintessence.h"
+#include "hq.h"
 #include "attack.h"
 
 
diff --git a/src/hyperbola-quintessence.c b/src/hq.c
similarity index 99%
rename from src/hyperbola-quintessence.c
rename to src/hq.c
index 5cf5589..2b6853c 100644
--- a/src/hyperbola-quintessence.c
+++ b/src/hq.c
@@ -19,7 +19,7 @@
 #include "chessdefs.h"
 #include "board.h"
 #include "bitboard.h"
-#include "hyperbola-quintessence.h"
+#include "hq.h"
 
 
 uchar bb_rank_attacks[64 * 8];
diff --git a/src/hyperbola-quintessence.h b/src/hq.h
similarity index 100%
rename from src/hyperbola-quintessence.h
rename to src/hq.h
diff --git a/src/init.c b/src/init.c
index 1a2e48e..0ed59a7 100644
--- a/src/init.c
+++ b/src/init.c
@@ -18,7 +18,7 @@
 #include "chessdefs.h"
 
 #include "bitboard.h"
-#include "hyperbola-quintessence.h"
+#include "hq.h"
 
 #include "hash.h"
 #include "hist.h"
diff --git a/src/move-gen.c b/src/move-gen.c
index 8336de7..1f1986b 100644
--- a/src/move-gen.c
+++ b/src/move-gen.c
@@ -22,7 +22,7 @@
 #include "piece.h"
 #include "position.h"
 #include "move.h"
-#include "hyperbola-quintessence.h"
+#include "hq.h"
 #include "attack.h"
 #include "move-gen.h"
 
diff --git a/src/move-gen.h b/src/move-gen.h
index c7595c3..89259a7 100644
--- a/src/move-gen.h
+++ b/src/move-gen.h
@@ -17,7 +17,7 @@
 #include "bitops.h"
 
 #include "bitboard.h"
-#include "hyperbola-quintessence.h"
+#include "hq.h"
 #include "piece.h"
 #include "move.h"
 
diff --git a/src/position.c b/src/position.c
index 3a3e868..2cc4c9c 100644
--- a/src/position.c
+++ b/src/position.c
@@ -24,7 +24,7 @@
 #include "chessdefs.h"
 #include "position.h"
 #include "bitboard.h"
-#include "hyperbola-quintessence.h"
+#include "hq.h"
 #include "fen.h"
 #include "piece.h"
 #include "misc.h"
diff --git a/test/bitboard-test.c b/test/bitboard-test.c
index cd27540..75b272d 100644
--- a/test/bitboard-test.c
+++ b/test/bitboard-test.c
@@ -18,7 +18,7 @@
 
 #include "chessdefs.h"
 #include "bitboard.h"
-#include "hyperbola-quintessence.h"
+#include "hq.h"
 
 int main(int __unused ac, __unused char**av)
 {