diff --git a/engine/gl/gl_alias.c b/engine/gl/gl_alias.c
index 40fa5716d..fec0184e9 100644
--- a/engine/gl/gl_alias.c
+++ b/engine/gl/gl_alias.c
@@ -794,7 +794,7 @@ static qboolean R_GAliasBuildMesh(mesh_t *mesh, galiasinfo_t *inf, int frame1, i
 		float mlerp;	//minor lerp, poses within a group.
 		qboolean hirachy;
 
-		if (g1->isheirachical != g2->isheirachical)
+		if (g1->isheirachical != g2->isheirachical || lerp < 0)
 			lerp = 0;
 		hirachy = g1->isheirachical;