diff --git a/gpxsee.pro b/gpxsee.pro
index 5e97c4a8..aabfc42a 100644
--- a/gpxsee.pro
+++ b/gpxsee.pro
@@ -467,7 +467,6 @@ win32 {
 
 unix:!macx {
     isEmpty(PREFIX):PREFIX = /usr/local
-    DEFINES += PREFIX=\\\"$$PREFIX\\\"
 
     maps.files = pkg/maps/*
     maps.path = $$PREFIX/share/gpxsee/maps