diff --git a/engines/balou/Makefile.am b/engines/balou/Makefile.am
index 96ae5c5..0e75249 100644
--- a/engines/balou/Makefile.am
+++ b/engines/balou/Makefile.am
@@ -29,6 +29,7 @@ libbalou_la_LDFLAGS =							\
 	-module
 
 libbalou_la_LIBADD =							\
+	-lm															\
 	$(top_builddir)/libxfsm/libxfsm-4.6.la				\
 	$(LIBXFCE4UI_LIBS)						\
 	$(XFCONF_LIBS)