diff --git a/src/crssync/main.cpp b/src/crssync/main.cpp
index fb0895d0e98..b2d1d9178ed 100644
--- a/src/crssync/main.cpp
+++ b/src/crssync/main.cpp
@@ -40,6 +40,8 @@ int main( int argc, char ** argv )
 {
   QgsApplication a( argc, argv, false );
 
+  a.setPrefixPath( CMAKE_INSTALL_PREFIX, true );
+
   std::cout << "Synchronizing CRS database with PROJ definitions." << std::endl;
 
   CPLPushErrorHandler( showError );