diff --git a/v5/patch.go b/v5/patch.go
index 83102e5..e42fa88 100644
--- a/v5/patch.go
+++ b/v5/patch.go
@@ -878,7 +878,7 @@ func ensurePathExists(pd *container, path string, options *ApplyOptions) error {
 				}
 
 				newNode := newLazyNode(newRawMessage(rawJSONArray))
-				doc.add(part, newNode, options)
+				doc.add(decodePatchKey(part), newNode, options)
 				doc, _ = newNode.intoAry()
 
 				// Pad the new array with null values up to the required index.
@@ -888,7 +888,7 @@ func ensurePathExists(pd *container, path string, options *ApplyOptions) error {
 			} else {
 				newNode := newLazyNode(newRawMessage(rawJSONObject))
 
-				doc.add(part, newNode, options)
+				doc.add(decodePatchKey(part), newNode, options)
 				doc, err = newNode.intoDoc(options)
 				if err != nil {
 					return err
diff --git a/v5/patch_test.go b/v5/patch_test.go
index 1f807f5..958a965 100644
--- a/v5/patch_test.go
+++ b/v5/patch_test.go
@@ -1245,3 +1245,26 @@ func init() {
 		"foo": &msg,
 	}
 }
+
+func TestEnsurePathEscapedSlash(t *testing.T) {
+	doc := `{ "foo": "bar" }`
+	patch := `[ { "op": "add", "path": "/with~1slash/nested", "value": "baz" } ]`
+	expected := `{"foo":"bar","with/slash":{"nested":"baz"}}`
+
+	p, err := DecodePatch([]byte(patch))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	options := NewApplyOptions()
+	options.EnsurePathExistsOnAdd = true
+
+	out, err := p.ApplyWithOptions([]byte(doc), options)
+	if err != nil {
+		t.Fatalf("Failed to apply patch: %v", err)
+	}
+
+	if !compareJSON(expected, string(out)) {
+		t.Fatalf("Expected:\n%s\nGot:\n%s", expected, string(out))
+	}
+}