diff --git a/stdlib/Pkg3/src/GraphType.jl b/stdlib/Pkg3/src/GraphType.jl
index 4d069c80d40411..c207f0cad1935a 100644
--- a/stdlib/Pkg3/src/GraphType.jl
+++ b/stdlib/Pkg3/src/GraphType.jl
@@ -519,7 +519,7 @@ function check_consistency(graph::Graph)
     for p0 in fix_inds
         @assert 1 ≤ p0 ≤ np
         @assert !gconstr[p0][end]
-        @assert count(gconstr[p0]) == 1
+        @assert count(gconstr[p0]) ≤ 1 # note: the 0 case should be handled by check_constraints
     end
 
     for (p,eq_cl) in eq_classes, (rvn,rvs) in eq_cl