diff --git a/src/Makefile b/src/Makefile
index 9b7174d0..4084aaf2 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -47,7 +47,7 @@ endif
 CC = gcc
 CCFLAGS = $(DFLAGS) -I. -Wall -Wtype-limits
 LDFLAGS += -lm
-LD = gcc -pthread
+LD = gcc -pthread -lrt
 YASM = yasm
 ASMOBJS = cpu.o
 OBJS = interface_main.o encmain.o bitstream.o cabac.o config.o context.o encoder.o filter.o inter.o intra.o nal.o picture.o rdo.o sao.o scalinglist.o search.o strategyselector.o tables.o threadqueue.o transform.o