diff --git a/src/apps/haiku3d/Haiku3d.rdef b/src/apps/haiku3d/Haiku3d.rdef
index 67dfa98c40..945a4268f2 100644
--- a/src/apps/haiku3d/Haiku3d.rdef
+++ b/src/apps/haiku3d/Haiku3d.rdef
@@ -20,7 +20,7 @@ resource app_version {
 	long_info = "Haiku3d ©2009 Haiku, Inc."
 };
 
-resource app_flags B_SINGLE_LAUNCH;
+resource app_flags B_MULTIPLE_LAUNCH;
 
 resource vector_icon {
 	$"6E6369660603040E0B02001602380BBEBE16B13FA2DA398FCAC733EC49EB0A00"