diff --git a/bin/Makefile.am b/bin/Makefile.am
index 7710550..465804c 100644
--- a/bin/Makefile.am
+++ b/bin/Makefile.am
@@ -21,47 +21,47 @@ bin_PROGRAMS			= mbus-tcp-scan mbus-tcp-request-data mbus-tcp-request-data-multi
 
 # tcp
 mbus_tcp_scan_LDFLAGS	= -L$(top_builddir)/mbus
-mbus_tcp_scan_LDADD		= -lmbus 
+mbus_tcp_scan_LDADD		= -lmbus -lm
 mbus_tcp_scan_SOURCES	= mbus-tcp-scan.c 
 
 mbus_tcp_request_data_LDFLAGS = -L$(top_builddir)/mbus
-mbus_tcp_request_data_LDADD	  = -lmbus
+mbus_tcp_request_data_LDADD	  = -lmbus -lm
 mbus_tcp_request_data_SOURCES = mbus-tcp-request-data.c
 
 mbus_tcp_request_data_multi_reply_LDFLAGS = -L$(top_builddir)/mbus
-mbus_tcp_request_data_multi_reply_LDADD	  = -lmbus
+mbus_tcp_request_data_multi_reply_LDADD	  = -lmbus -lm
 mbus_tcp_request_data_multi_reply_SOURCES = mbus-tcp-request-data-multi-reply.c
 
 mbus_tcp_select_secondary_LDFLAGS = -L$(top_builddir)/mbus
-mbus_tcp_select_secondary_LDADD	  = -lmbus
+mbus_tcp_select_secondary_LDADD	  = -lmbus -lm
 mbus_tcp_select_secondary_SOURCES = mbus-tcp-select-secondary.c
 
 mbus_tcp_scan_secondary_LDFLAGS = -L$(top_builddir)/mbus
-mbus_tcp_scan_secondary_LDADD	= -lmbus
+mbus_tcp_scan_secondary_LDADD	= -lmbus -lm
 mbus_tcp_scan_secondary_SOURCES = mbus-tcp-scan-secondary.c
 
 # serial
 mbus_serial_scan_LDFLAGS	= -L$(top_builddir)/mbus
-mbus_serial_scan_LDADD		= -lmbus 
+mbus_serial_scan_LDADD		= -lmbus -lm
 mbus_serial_scan_SOURCES	= mbus-serial-scan.c 
 
 mbus_serial_request_data_LDFLAGS = -L$(top_builddir)/mbus
-mbus_serial_request_data_LDADD	 = -lmbus
+mbus_serial_request_data_LDADD	 = -lmbus -lm
 mbus_serial_request_data_SOURCES = mbus-serial-request-data.c
 
 mbus_serial_request_data_multi_reply_LDFLAGS = -L$(top_builddir)/mbus
-mbus_serial_request_data_multi_reply_LDADD   = -lmbus
+mbus_serial_request_data_multi_reply_LDADD   = -lmbus -lm
 mbus_serial_request_data_multi_reply_SOURCES = mbus-serial-request-data-multi-reply.c
 
 mbus_serial_select_secondary_LDFLAGS = -L$(top_builddir)/mbus
-mbus_serial_select_secondary_LDADD	 = -lmbus
+mbus_serial_select_secondary_LDADD	 = -lmbus -lm
 mbus_serial_select_secondary_SOURCES = mbus-serial-select-secondary.c
 
 mbus_serial_scan_secondary_LDFLAGS = -L$(top_builddir)/mbus
-mbus_serial_scan_secondary_LDADD   = -lmbus
+mbus_serial_scan_secondary_LDADD   = -lmbus -lm
 mbus_serial_scan_secondary_SOURCES = mbus-serial-scan-secondary.c
 
 mbus_serial_switch_baudrate_LDFLAGS = -L$(top_builddir)/mbus
-mbus_serial_switch_baudrate_LDADD   = -lmbus
+mbus_serial_switch_baudrate_LDADD   = -lmbus -lm
 mbus_serial_switch_baudrate_SOURCES = mbus-serial-switch-baudrate.c
 
diff --git a/test/Makefile.am b/test/Makefile.am
index 82c3f2a..440f53d 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -16,14 +16,14 @@ noinst_HEADERS			=
 noinst_PROGRAMS			= mbus_unit_test1 mbus_parse mbus_parse_hex
 
 mbus_unit_test1_LDFLAGS	= -L$(top_builddir)/mbus
-mbus_unit_test1_LDADD	= -lmbus -lcunit -lncurses
+mbus_unit_test1_LDADD	= -lmbus -lcunit -lncurses -lm
 mbus_unit_test1_SOURCES	= mbus_unit_test1.c
 
 mbus_parse_LDFLAGS	= -L$(top_builddir)/mbus
-mbus_parse_LDADD	= -lmbus
+mbus_parse_LDADD	= -lmbus -lm
 mbus_parse_SOURCES	= mbus_parse.c
 
 mbus_parse_hex_LDFLAGS	= -L$(top_builddir)/mbus
-mbus_parse_hex_LDADD	= -lmbus
+mbus_parse_hex_LDADD	= -lmbus -lm
 mbus_parse_hex_SOURCES	= mbus_parse_hex.c