diff --git a/gpxsee.pro b/gpxsee.pro
index 4d70424b..85a9a577 100644
--- a/gpxsee.pro
+++ b/gpxsee.pro
@@ -362,6 +362,7 @@ win32 {
 
 unix:!macx {
     isEmpty(PREFIX):PREFIX = /usr/local
+    lessThan(QT_MAJOR_VERSION, 5) {DEFINES += PREFIX=\\\"$$PREFIX\\\"}
 
     maps.files = pkg/maps/*
     maps.path = $$PREFIX/share/gpxsee/maps
diff --git a/src/common/programpaths.cpp b/src/common/programpaths.cpp
index d9023716..1073f1f6 100644
--- a/src/common/programpaths.cpp
+++ b/src/common/programpaths.cpp
@@ -31,7 +31,7 @@
 #else
 #define USER_DIR        QDir::homePath() + QString("/.local/share/") \
 						  + qApp->applicationName()
-#define GLOBAL_DIR      QString("/usr/share/") + qApp->applicationName()
+#define GLOBAL_DIR      QString(PREFIX "/share/") + qApp->applicationName()
 #endif
 
 static QString dir(const QString &dirName, bool writable = false)