diff --git a/simul_response.pro b/simul_response.pro
index 0dc28be..27dc898 100644
--- a/simul_response.pro
+++ b/simul_response.pro
@@ -12,3 +12,5 @@ HEADERS += \
     simul_drv_lcd.h \
     simul_kl25z.h \
     simul_regs.h
+
+LIBS += -lpthread