diff --git a/tests/Makefile.am b/tests/Makefile.am
index fb87a2918..b2ec16650 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -43,7 +43,7 @@ endif
 rigctl_CPPFLAGS = -I$(top_builddir)/tests -I$(top_builddir)/src -I$(srcdir) -I$(top_builddir)/security $(AM_CPPFLAGS) 
 
 # all the programs need this
-LDADD = $(top_builddir)/src/libhamlib.la $(top_builddir)/lib/libmisc.la $(DL_LIBS)
+LDADD = $(top_builddir)/src/libhamlib.la $(top_builddir)/lib/libmisc.la $(DL_LIBS) -lm
 
 rigmem_CFLAGS = $(AM_CFLAGS) $(LIBXML2_CFLAGS) -I$(top_builddir)/src
 rigctld_CFLAGS = $(AM_CFLAGS) $(PTHREAD_CFLAGS) -I$(top_builddir)/src -I$(top_builddir)/security