diff --git a/loader/merge.go b/loader/merge.go
index dd4fe429..78af4cfe 100644
--- a/loader/merge.go
+++ b/loader/merge.go
@@ -148,7 +148,11 @@ func toServicePortConfigsMap(s interface{}) (map[interface{}]interface{}, error)
 	}
 	m := map[interface{}]interface{}{}
 	for _, p := range ports {
-		m[p.Published] = p
+		k := p.Published
+		if k == 0 {
+			k = p.Target
+		}
+		m[k] = p
 	}
 	return m, nil
 }
diff --git a/loader/merge_test.go b/loader/merge_test.go
index 1e9ea04b..7bc01776 100644
--- a/loader/merge_test.go
+++ b/loader/merge_test.go
@@ -306,6 +306,30 @@ func TestLoadMultipleServicePorts(t *testing.T) {
 				},
 			},
 		},
+		{
+			name: "override_one_sided",
+			portBase: map[string]interface{}{
+				"ports": []interface{}{
+					"5000",
+					"6000",
+				},
+			},
+			portOverride: map[string]interface{}{},
+			expected: []types.ServicePortConfig{
+				{
+					Mode:      "ingress",
+					Published: 0,
+					Target:    5000,
+					Protocol:  "tcp",
+				},
+				{
+					Mode:      "ingress",
+					Published: 0,
+					Target:    6000,
+					Protocol:  "tcp",
+				},
+			},
+		},
 	}
 
 	for _, tc := range portsCases {