diff --git a/pkg/engine/funcs.go b/pkg/engine/funcs.go
index d03a818c2..5eef2a2b8 100644
--- a/pkg/engine/funcs.go
+++ b/pkg/engine/funcs.go
@@ -95,7 +95,7 @@ func toYAMLPretty(v interface{}) string {
 	var data bytes.Buffer
 	encoder := goYaml.NewEncoder(&data)
 	encoder.SetIndent(2)
-	err := encoder.Encode(v)
+	err := encoder.Encode(normalizeYAMLScalars(v))
 
 	if err != nil {
 		// Swallow errors inside of a template.
@@ -104,6 +104,37 @@ func toYAMLPretty(v interface{}) string {
 	return strings.TrimSuffix(data.String(), "\n")
 }
 
+func normalizeYAMLScalars(v any) any {
+	switch typedValue := v.(type) {
+	case map[string]any:
+		normalized := make(map[string]any, len(typedValue))
+		for key, value := range typedValue {
+			normalized[key] = normalizeYAMLScalars(value)
+		}
+		return normalized
+	case map[any]any:
+		normalized := make(map[any]any, len(typedValue))
+		for key, value := range typedValue {
+			normalized[key] = normalizeYAMLScalars(value)
+		}
+		return normalized
+	case []any:
+		normalized := make([]any, len(typedValue))
+		for index, value := range typedValue {
+			normalized[index] = normalizeYAMLScalars(value)
+		}
+		return normalized
+	case float64:
+		// sigs.k8s.io/yaml may unmarshal integer YAML values as float64.
+		if typedValue == math.Trunc(typedValue) &&
+			typedValue > float64(math.MinInt64) &&
+			typedValue < float64(math.MaxInt64) {
+			return int64(typedValue)
+		}
+	}
+	return v
+}
+
 // fromYAML converts a YAML document into a map[string]interface{}.
 //
 // This is not a general-purpose YAML parser, and will not parse all valid
diff --git a/pkg/engine/funcs_test.go b/pkg/engine/funcs_test.go
index a7e2506a3..c876dd318 100644
--- a/pkg/engine/funcs_test.go
+++ b/pkg/engine/funcs_test.go
@@ -37,6 +37,10 @@ func TestFuncs(t *testing.T) {
 		tpl:    `{{ toYamlPretty . }}`,
 		expect: "baz:\n  - 1\n  - 2\n  - 3",
 		vars:   map[string]interface{}{"baz": []int{1, 2, 3}},
+	}, {
+		tpl:    `{{ toYamlPretty (fromYaml .) }}`,
+		expect: "foo: 1000000",
+		vars:   "foo: !!int 1000000",
 	}, {
 		tpl:    `{{ toToml . }}`,
 		expect: "foo = \"bar\"\n",