diff --git a/android/hooks.go b/android/hooks.go
index 85fc081..9eaa1ac 100644
--- a/android/hooks.go
+++ b/android/hooks.go
@@ -65,10 +65,10 @@
 	return l.bp.ModuleFactories()
 }
 
-func (l *loadHookContext) AppendProperties(props ...interface{}) {
+func (l *loadHookContext) appendPrependHelper(props []interface{},
+	extendFn func([]interface{}, interface{}, proptools.ExtendPropertyFilterFunc) error) {
 	for _, p := range props {
-		err := proptools.AppendMatchingProperties(l.Module().base().customizableProperties,
-			p, nil)
+		err := extendFn(l.Module().base().customizableProperties, p, nil)
 		if err != nil {
 			if propertyErr, ok := err.(*proptools.ExtendPropertyError); ok {
 				l.PropertyErrorf(propertyErr.Property, "%s", propertyErr.Err.Error())
@@ -78,19 +78,12 @@
 		}
 	}
 }
+func (l *loadHookContext) AppendProperties(props ...interface{}) {
+	l.appendPrependHelper(props, proptools.AppendMatchingProperties)
+}
 
 func (l *loadHookContext) PrependProperties(props ...interface{}) {
-	for _, p := range props {
-		err := proptools.PrependMatchingProperties(l.Module().base().customizableProperties,
-			p, nil)
-		if err != nil {
-			if propertyErr, ok := err.(*proptools.ExtendPropertyError); ok {
-				l.PropertyErrorf(propertyErr.Property, "%s", propertyErr.Err.Error())
-			} else {
-				panic(err)
-			}
-		}
-	}
+	l.appendPrependHelper(props, proptools.PrependMatchingProperties)
 }
 
 func (l *loadHookContext) CreateModule(factory ModuleFactory, props ...interface{}) Module {
diff --git a/android/module.go b/android/module.go
index e100330..4a388b5 100644
--- a/android/module.go
+++ b/android/module.go
@@ -1148,7 +1148,7 @@
 //         }
 //     }
 //
-//     func NewMyModule() android.Module) {
+//     func NewMyModule() android.Module {
 //         m := &myModule{}
 //         m.AddProperties(&m.properties)
 //         android.InitAndroidModule(m)
diff --git a/android/mutator.go b/android/mutator.go
index 4b37377..461cb17 100644
--- a/android/mutator.go
+++ b/android/mutator.go
@@ -529,10 +529,10 @@
 	mod.base().addBp2buildInfo(info)
 }
 
-func (t *topDownMutatorContext) AppendProperties(props ...interface{}) {
+func (t *topDownMutatorContext) appendPrependHelper(props []interface{},
+	extendFn func([]interface{}, interface{}, proptools.ExtendPropertyFilterFunc) error) {
 	for _, p := range props {
-		err := proptools.AppendMatchingProperties(t.Module().base().customizableProperties,
-			p, nil)
+		err := extendFn(t.Module().base().customizableProperties, p, nil)
 		if err != nil {
 			if propertyErr, ok := err.(*proptools.ExtendPropertyError); ok {
 				t.PropertyErrorf(propertyErr.Property, "%s", propertyErr.Err.Error())
@@ -543,18 +543,12 @@
 	}
 }
 
+func (t *topDownMutatorContext) AppendProperties(props ...interface{}) {
+	t.appendPrependHelper(props, proptools.AppendMatchingProperties)
+}
+
 func (t *topDownMutatorContext) PrependProperties(props ...interface{}) {
-	for _, p := range props {
-		err := proptools.PrependMatchingProperties(t.Module().base().customizableProperties,
-			p, nil)
-		if err != nil {
-			if propertyErr, ok := err.(*proptools.ExtendPropertyError); ok {
-				t.PropertyErrorf(propertyErr.Property, "%s", propertyErr.Err.Error())
-			} else {
-				panic(err)
-			}
-		}
-	}
+	t.appendPrependHelper(props, proptools.PrependMatchingProperties)
 }
 
 // android.topDownMutatorContext either has to embed blueprint.TopDownMutatorContext, in which case every method that