diff --git a/Makefile.tools b/Makefile.tools
index d849bd9..6ebbe9f 100644
--- a/Makefile.tools
+++ b/Makefile.tools
@@ -294,7 +294,7 @@ tools_mcaptest_SOURCES = tools/mcaptest.c \
 				btio/btio.h btio/btio.c \
 				src/log.c src/log.h \
 				profiles/health/mcap.h profiles/health/mcap.c
-tools_mcaptest_LDADD = lib/libbluetooth-internal.la @GLIB_LIBS@
+tools_mcaptest_LDADD = lib/libbluetooth-internal.la @GLIB_LIBS@ -lrt
 
 tools_bneptest_SOURCES = tools/bneptest.c \
 				btio/btio.h btio/btio.c \