diff --git a/ground/openpilotgcs/src/libs/qwt/src/src.pro b/ground/openpilotgcs/src/libs/qwt/src/src.pro
index a70a9a8ce..93cb58d90 100644
--- a/ground/openpilotgcs/src/libs/qwt/src/src.pro
+++ b/ground/openpilotgcs/src/libs/qwt/src/src.pro
@@ -24,7 +24,7 @@ else {
 CONFIG += staticlib
 }
 
-unix:LIBS += -lrt
+unix:!mac:LIBS += -lrt
 
 HEADERS += \
     qwt.h \
@@ -204,4 +204,4 @@ contains(QWT_CONFIG, QwtWidgets) {
         qwt_slider.cpp \
         qwt_thermo.cpp \
         qwt_wheel.cpp
-}
+}
\ No newline at end of file