gistfile.patch

diff --git a/lib/arborist/build-ideal-tree.js b/lib/arborist/build-ideal-tree.js
index 78192cdd..49b21ca2 100644
--- a/lib/arborist/build-ideal-tree.js
+++ b/lib/arborist/build-ideal-tree.js
@@ -1647,12 +1647,34 @@ This is a one-time fix-up, please be patient...
               // to get the conflict here so that we can decide whether to
               // accept the current dep node, clobber it, or fail the install.
               if (edge.from === target && edge.valid) {
+                // replacement from virtual root
                 const rep = dep.parent.children.get(edge.name)
-                const override = rep && ([...rep.edgesIn].some(e => !e.valid))
-                if (!rep || !rep.satisfies(edge) || override) {
-                  canReplace = false
-                  break OUTER
+                // not going to replace it, so make sure it won't cause problems
+                // if the things we ARE replacing are going to break the edges
+                // for the thing that has to be here, then it's a conflict.
+                if (!rep) {
+                  const current = edge.to
+                  for (const repEdge of current.edgesOut.values()) {
+                    const newRepDep = dep.parent.children.get(repEdge.name)
+                    if (repEdge.valid && newRepDep && !newRepDep.satisfies(repEdge)) {
+                      canReplace = false
+                      break OUTER
+                    }
+                  }
+                  continue
                 }
+
+                // was said replacement an override already?
+                const override = [...rep.edgesIn].some(e => !e.valid)
+                // if we have a rep, and it's ok to put in this location, and
+                // it's not already part of an override in the peerSet, then
+                // we can continue with it.
+                if (rep.satisfies(edge) && !override)
+                  continue
+
+                // Otherwise, we cannot replace.
+                canReplace = false
+                break OUTER
               }
             }
           }