diff --git a/Makefile b/Makefile
index 7e67d30..5bf53ba 100644
--- a/Makefile
+++ b/Makefile
@@ -40,7 +40,7 @@ kpengine: $(OBJS)
 	$(CC) -o kpengine $(OBJS) $(GLIBLIBS) $(LDFLAGS)
 
 kanjipad: kanjipad.o padarea.o
-	$(CC) -o kanjipad kanjipad.o padarea.o $(GTKLIBS) $(LDFLAGS)
+	$(CC) -o kanjipad kanjipad.o padarea.o -lm $(GTKLIBS) $(LDFLAGS)
 
 jdata.dat: jstroke/strokedata.h conv_jdata.pl
 	perl conv_jdata.pl < jstroke/strokedata.h > jdata.dat