--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -255,7 +255,7 @@
 						   module_peep.c module_peep.h debug.h \
 						   tcp.c tcp.h
 
-pbbuttonsd_LDADD = -lpbb $(INTLLIBS) $(PB_OBJECTS) $(PB_LIBS) @PACKAGE_LIBS@
+pbbuttonsd_LDADD = -lpbb -lm $(INTLLIBS) $(PB_OBJECTS) $(PB_LIBS) @PACKAGE_LIBS@
 pbbuttonsd_LDFLAGS = -L$(top_srcdir)/libpbbipc
 pbbuttonsd_DEPENDENCIES = $(PB_OBJECTS)
 @DEBUG_TRUE@AM_CFLAGS1 = -DDEBUG