diff --git a/src/pdf/SkPDFTypes.cpp b/src/pdf/SkPDFTypes.cpp
index f97f21b..5a0ede8 100644
--- a/src/pdf/SkPDFTypes.cpp
+++ b/src/pdf/SkPDFTypes.cpp
@@ -297,7 +297,8 @@
     for (size_t i = 0; i < input.size(); i++) {
         if (input[i] & 0x80 || input[i] < '!' || input[i] == '#') {
             result.append("#");
-            result.appendHex(input[i], 2);
+            // Mask with 0xFF to avoid sign extension. i.e. #FFFFFF81
+            result.appendHex(input[i] & 0xFF, 2);
         } else {
             result.append(input.c_str() + i, 1);
         }
diff --git a/tests/PDFPrimitivesTest.cpp b/tests/PDFPrimitivesTest.cpp
index 82686ef..1aed3ad 100644
--- a/tests/PDFPrimitivesTest.cpp
+++ b/tests/PDFPrimitivesTest.cpp
@@ -275,6 +275,14 @@
     CheckObjectOutput(reporter, name.get(), expectedResult,
                       strlen(expectedResult), false, false);
 
+    // Test that we correctly handle characters with the high-bit set.
+    char highBitCString[] = {0xDE, 0xAD, 'b', 'e', 0xEF, 0};
+    SkRefPtr<SkPDFName> highBitName = new SkPDFName(highBitCString);
+    name->unref();  // SkRefPtr and new both took a reference.
+    const char highBitExpectedResult[] = "/#DE#ADbe#EF";
+    CheckObjectOutput(reporter, highBitName.get(), highBitExpectedResult,
+                      strlen(highBitExpectedResult), false, false);
+
     SkRefPtr<SkPDFArray> array = new SkPDFArray;
     array->unref();  // SkRefPtr and new both took a reference.
     SimpleCheckObjectOutput(reporter, array.get(), "[]");