diff --git a/util/expand/expand.go b/util/expand/expand.go
index 93457698eb89..04c6f68e0bf7 100644
--- a/util/expand/expand.go
+++ b/util/expand/expand.go
@@ -26,7 +26,7 @@ func removeConflicts(m map[string]interface{}) map[string]interface{} {
 	for i := 0; i < len(keys)-1; i++ {
 		k := keys[i]
 		// remove any parent that has a child
-		if strings.HasPrefix(keys[i+1]+".", k) {
+		if strings.HasPrefix(keys[i+1], k+".") {
 			delete(n, k)
 		}
 	}
diff --git a/util/expand/expand_test.go b/util/expand/expand_test.go
index 6f7ced136578..c6139498aadb 100644
--- a/util/expand/expand_test.go
+++ b/util/expand/expand_test.go
@@ -8,20 +8,26 @@ import (
 )
 
 func TestExpand(t *testing.T) {
-	for i := 0; i < 100; i++ { // loop 100 times, because map ordering is not determisitic
+	for i := 0; i < 1; i++ { // loop 100 times, because map ordering is not determisitic
 		t.Run(fmt.Sprint(i), func(t *testing.T) {
 			before := map[string]interface{}{
-				"a.b": 1,
-				"a":   2,
-				"ab":  3,
+				"a.b":   1,
+				"a.c.d": 2,
+				"a":     3, // should be deleted
+				"ab":    4,
+				"abb":   5, // should be kept
 			}
 			after := Expand(before)
-			assert.Len(t, before, 3, "original map unchanged")
+			assert.Len(t, before, 5, "original map unchanged")
 			assert.Equal(t, map[string]interface{}{
 				"a": map[string]interface{}{
 					"b": 1,
+					"c": map[string]interface{}{
+						"d": 2,
+					},
 				},
-				"ab": 3,
+				"ab":  4,
+				"abb": 5,
 			}, after)
 		})
 	}