diff --git a/owlps-udp-to-http/Makefile b/owlps-udp-to-http/Makefile
index 817f7ae..fa93d9b 100644
--- a/owlps-udp-to-http/Makefile
+++ b/owlps-udp-to-http/Makefile
@@ -35,7 +35,7 @@ XCFLAGS = $(CFLAGS) $(DEPFLAGS) $(WARN) $(HEADERS)
 PICFLAG = -fPIC
 OWLPSFLAGS = -D OWLPS_VERSION=\"$(OWLPS_VERSION)\"
 OWLPSFLAGS += -D DEBUG
-LIBS = -L$(LIBOWLPS_DIR) -lowlps \
+LIBS = -pthread -L$(LIBOWLPS_DIR) -lowlps \
 	-L$(LIBOWLPSRESULTREADERUDP_DIR) -lowlps-resultreader-udp
 
 OS := $(shell uname)