diff --git a/android/expand.go b/android/expand.go
index 527c4ac..67fb4ee 100644
--- a/android/expand.go
+++ b/android/expand.go
@@ -18,12 +18,30 @@
 	"fmt"
 	"strings"
 	"unicode"
+
+	"github.com/google/blueprint/proptools"
 )
 
+// ExpandNinjaEscaped substitutes $() variables in a string
+// $(var) is passed to mapping(var), which should return the expanded value, a bool for whether the result should
+// be left unescaped when using in a ninja value (generally false, true if the expanded value is a ninja variable like
+// '${in}'), and an error.
+// $$ is converted to $, which is escaped back to $$.
+func ExpandNinjaEscaped(s string, mapping func(string) (string, bool, error)) (string, error) {
+	return expand(s, true, mapping)
+}
+
 // Expand substitutes $() variables in a string
-// $(var) is passed to Expander(var)
-// $$ is converted to $
+// $(var) is passed to mapping(var), which should return the expanded value and an error.
+// $$ is converted to $.
 func Expand(s string, mapping func(string) (string, error)) (string, error) {
+	return expand(s, false, func(s string) (string, bool, error) {
+		s, err := mapping(s)
+		return s, false, err
+	})
+}
+
+func expand(s string, ninjaEscape bool, mapping func(string) (string, bool, error)) (string, error) {
 	// based on os.Expand
 	buf := make([]byte, 0, 2*len(s))
 	i := 0
@@ -33,10 +51,13 @@
 				return "", fmt.Errorf("expected character after '$'")
 			}
 			buf = append(buf, s[i:j]...)
-			value, w, err := getMapping(s[j+1:], mapping)
+			value, ninjaVariable, w, err := getMapping(s[j+1:], mapping)
 			if err != nil {
 				return "", err
 			}
+			if !ninjaVariable && ninjaEscape {
+				value = proptools.NinjaEscape(value)
+			}
 			buf = append(buf, value...)
 			j += w
 			i = j + 1
@@ -45,26 +66,26 @@
 	return string(buf) + s[i:], nil
 }
 
-func getMapping(s string, mapping func(string) (string, error)) (string, int, error) {
+func getMapping(s string, mapping func(string) (string, bool, error)) (string, bool, int, error) {
 	switch s[0] {
 	case '(':
 		// Scan to closing brace
 		for i := 1; i < len(s); i++ {
 			if s[i] == ')' {
-				ret, err := mapping(strings.TrimSpace(s[1:i]))
-				return ret, i + 1, err
+				ret, ninjaVariable, err := mapping(strings.TrimSpace(s[1:i]))
+				return ret, ninjaVariable, i + 1, err
 			}
 		}
-		return "", len(s), fmt.Errorf("missing )")
+		return "", false, len(s), fmt.Errorf("missing )")
 	case '$':
-		return "$$", 1, nil
+		return "$", false, 1, nil
 	default:
 		i := strings.IndexFunc(s, unicode.IsSpace)
 		if i == 0 {
-			return "", 0, fmt.Errorf("unexpected character '%c' after '$'", s[0])
+			return "", false, 0, fmt.Errorf("unexpected character '%c' after '$'", s[0])
 		} else if i == -1 {
 			i = len(s)
 		}
-		return "", 0, fmt.Errorf("expected '(' after '$', did you mean $(%s)?", s[:i])
+		return "", false, 0, fmt.Errorf("expected '(' after '$', did you mean $(%s)?", s[:i])
 	}
 }
diff --git a/android/expand_test.go b/android/expand_test.go
index 128de8a..12179ed 100644
--- a/android/expand_test.go
+++ b/android/expand_test.go
@@ -20,88 +20,111 @@
 )
 
 var vars = map[string]string{
-	"var1": "abc",
-	"var2": "",
-	"var3": "def",
-	"💩":    "😃",
+	"var1":   "abc",
+	"var2":   "",
+	"var3":   "def",
+	"💩":      "😃",
+	"escape": "${in}",
 }
 
-func expander(s string) (string, error) {
+func expander(s string) (string, bool, error) {
 	if val, ok := vars[s]; ok {
-		return val, nil
+		return val, s == "escape", nil
 	} else {
-		return "", fmt.Errorf("unknown variable %q", s)
+		return "", false, fmt.Errorf("unknown variable %q", s)
 	}
 }
 
 var expandTestCases = []struct {
-	in  string
-	out string
-	err bool
+	in          string
+	out         string
+	out_escaped string
+	err         bool
 }{
 	{
-		in:  "$(var1)",
-		out: "abc",
+		in:          "$(var1)",
+		out:         "abc",
+		out_escaped: "abc",
 	},
 	{
-		in:  "$( var1 )",
-		out: "abc",
+		in:          "$( var1 )",
+		out:         "abc",
+		out_escaped: "abc",
 	},
 	{
-		in:  "def$(var1)",
-		out: "defabc",
+		in:          "def$(var1)",
+		out:         "defabc",
+		out_escaped: "defabc",
 	},
 	{
-		in:  "$(var1)def",
-		out: "abcdef",
+		in:          "$(var1)def",
+		out:         "abcdef",
+		out_escaped: "abcdef",
 	},
 	{
-		in:  "def$(var1)def",
-		out: "defabcdef",
+		in:          "def$(var1)def",
+		out:         "defabcdef",
+		out_escaped: "defabcdef",
 	},
 	{
-		in:  "$(var2)",
-		out: "",
+		in:          "$(var2)",
+		out:         "",
+		out_escaped: "",
 	},
 	{
-		in:  "def$(var2)",
-		out: "def",
+		in:          "def$(var2)",
+		out:         "def",
+		out_escaped: "def",
 	},
 	{
-		in:  "$(var2)def",
-		out: "def",
+		in:          "$(var2)def",
+		out:         "def",
+		out_escaped: "def",
 	},
 	{
-		in:  "def$(var2)def",
-		out: "defdef",
+		in:          "def$(var2)def",
+		out:         "defdef",
+		out_escaped: "defdef",
 	},
 	{
-		in:  "$(var1)$(var3)",
-		out: "abcdef",
+		in:          "$(var1)$(var3)",
+		out:         "abcdef",
+		out_escaped: "abcdef",
 	},
 	{
-		in:  "$(var1)g$(var3)",
-		out: "abcgdef",
+		in:          "$(var1)g$(var3)",
+		out:         "abcgdef",
+		out_escaped: "abcgdef",
 	},
 	{
-		in:  "$$",
-		out: "$$",
+		in:          "$$",
+		out:         "$",
+		out_escaped: "$$",
 	},
 	{
-		in:  "$$(var1)",
-		out: "$$(var1)",
+		in:          "$$(var1)",
+		out:         "$(var1)",
+		out_escaped: "$$(var1)",
 	},
 	{
-		in:  "$$$(var1)",
-		out: "$$abc",
+		in:          "$$$(var1)",
+		out:         "$abc",
+		out_escaped: "$$abc",
 	},
 	{
-		in:  "$(var1)$$",
-		out: "abc$$",
+		in:          "$(var1)$$",
+		out:         "abc$",
+		out_escaped: "abc$$",
 	},
 	{
-		in:  "$(💩)",
-		out: "😃",
+		in:          "$(💩)",
+		out:         "😃",
+		out_escaped: "😃",
+	},
+	{
+		in:          "$$a$(escape)$$b",
+		out:         "$a${in}$b",
+		out_escaped: "$$a${in}$$b",
 	},
 
 	// Errors
@@ -141,7 +164,10 @@
 
 func TestExpand(t *testing.T) {
 	for _, test := range expandTestCases {
-		got, err := Expand(test.in, expander)
+		got, err := Expand(test.in, func(s string) (string, error) {
+			s, _, err := expander(s)
+			return s, err
+		})
 		if err != nil && !test.err {
 			t.Errorf("%q: unexpected error %s", test.in, err.Error())
 		} else if err == nil && test.err {
@@ -151,3 +177,16 @@
 		}
 	}
 }
+
+func TestExpandNinjaEscaped(t *testing.T) {
+	for _, test := range expandTestCases {
+		got, err := ExpandNinjaEscaped(test.in, expander)
+		if err != nil && !test.err {
+			t.Errorf("%q: unexpected error %s", test.in, err.Error())
+		} else if err == nil && test.err {
+			t.Errorf("%q: expected error, got %q", test.in, got)
+		} else if !test.err && got != test.out_escaped {
+			t.Errorf("%q: expected %q, got %q", test.in, test.out, got)
+		}
+	}
+}