diff --git a/srcpkgs/flightgear/template b/srcpkgs/flightgear/template
index 6f4f9ffdfb7..389b512e41d 100644
--- a/srcpkgs/flightgear/template
+++ b/srcpkgs/flightgear/template
@@ -38,6 +38,8 @@ if [ "$XBPS_TARGET_LIBC" = "musl" ]; then
 	configure_args+=" -DCMAKE_EXE_LINKER_FLAGS=-lexecinfo"
 fi
 
+CXXFLAGS=" -D_LARGE_FILE_SOURCE=1 -D_FILE_OFFSET_BITS=64"
+
 post_extract() {
 	mv flightgear-$version/* .
 }