diff --git a/ivp_intern/ivp_impact.cxx b/ivp_intern/ivp_impact.cxx
index 736200d..66880e8 100644
--- a/ivp_intern/ivp_impact.cxx
+++ b/ivp_intern/ivp_impact.cxx
@@ -1241,6 +1241,7 @@ void IVP_Mindist::do_impact(){
 		// BUGBUG: someone changed a collision filter and didn't tell us!
 		IVP_ASSERT(0);
 		delete this;
+		g_fDeferDeleteMindist = false;
 		return;
 	}