diff --git a/xwindow/Makefile.in b/xwindow/Makefile.in
index 50137e0..1e83104 100644
--- a/xwindow/Makefile.in
+++ b/xwindow/Makefile.in
@@ -32,7 +32,7 @@ OBJ = $(OBJ1) $(OBJ2@WIN32TAG@)
 
 LKIK = @LKIK@
 LMKF = @LMKF@
-LMLTERM = ../mlterm/libmlterm.a ../mlterm/@LMLTERM_CORE@
+LMLTERM = ../mlterm/libmlterm.a ../mlterm/@LMLTERM_CORE@ -lm
 LKIK_DEB = -lkik_deb
 LMKF_DEB = -lmkf_deb