diff --git a/mk/board_native.mk b/mk/board_native.mk
index 2343f2003a..56112fdf5b 100644
--- a/mk/board_native.mk
+++ b/mk/board_native.mk
@@ -62,7 +62,7 @@ ifneq ($(SYSTYPE),Darwin)
 LDFLAGS        +=   -Wl,--gc-sections -Wl,-Map -Wl,$(SKETCHMAP)
 endif
 
-LIBS ?= -lm -pthread
+LIBS ?= -lm -lrt -pthread
 ifneq ($(findstring CYGWIN, $(SYSTYPE)),)
 LIBS += -lwinmm
 endif