diff --git a/libutils/String16.cpp b/libutils/String16.cpp
index 70bf5a0fb..e3e5f1106 100644
--- a/libutils/String16.cpp
+++ b/libutils/String16.cpp
@@ -390,28 +390,6 @@ size_t String16::staticStringSize() const {
     return static_cast<size_t>(*(p - 1));
 }
 
-status_t String16::makeLower()
-{
-    const size_t N = size();
-    const char16_t* str = string();
-    char16_t* edited = nullptr;
-    for (size_t i=0; i<N; i++) {
-        const char16_t v = str[i];
-        if (v >= 'A' && v <= 'Z') {
-            if (!edited) {
-                SharedBuffer* buf = static_cast<SharedBuffer*>(edit());
-                if (!buf) {
-                    return NO_MEMORY;
-                }
-                edited = (char16_t*)buf->data();
-                mString = str = edited;
-            }
-            edited[i] = tolower((char)v);
-        }
-    }
-    return OK;
-}
-
 status_t String16::replaceAll(char16_t replaceThis, char16_t withThis)
 {
     const size_t N = size();
diff --git a/libutils/String16_fuzz.cpp b/libutils/String16_fuzz.cpp
index 63c280071..defa0f5a6 100644
--- a/libutils/String16_fuzz.cpp
+++ b/libutils/String16_fuzz.cpp
@@ -34,11 +34,6 @@ std::vector<std::function<void(FuzzedDataProvider&, android::String16, android::
                     str1.size();
                 }),
 
-                // Casing
-                ([](FuzzedDataProvider&, android::String16 str1, android::String16) -> void {
-                    str1.makeLower();
-                }),
-
                 // Comparison
                 ([](FuzzedDataProvider&, android::String16 str1, android::String16 str2) -> void {
                     str1.startsWith(str2);
diff --git a/libutils/String16_test.cpp b/libutils/String16_test.cpp
index 9e02b7886..788da8e0e 100644
--- a/libutils/String16_test.cpp
+++ b/libutils/String16_test.cpp
@@ -111,13 +111,6 @@ TEST(String16Test, RemoveOutOfBounds) {
     EXPECT_STR16EQ(u" me", tmp);
 }
 
-TEST(String16Test, MakeLower) {
-    String16 tmp("Verify Me!");
-    tmp.makeLower();
-    EXPECT_EQ(10U, tmp.size());
-    EXPECT_STR16EQ(u"verify me!", tmp);
-}
-
 TEST(String16Test, ReplaceAll) {
     String16 tmp("Verify verify Verify");
     tmp.replaceAll(u'r', u'!');
@@ -190,14 +183,6 @@ TEST(String16Test, StaticStringRemove) {
     EXPECT_FALSE(tmp.isStaticString());
 }
 
-TEST(String16Test, StaticStringMakeLower) {
-    StaticString16 tmp(u"Verify me!");
-    tmp.makeLower();
-    EXPECT_EQ(10U, tmp.size());
-    EXPECT_STR16EQ(u"verify me!", tmp);
-    EXPECT_FALSE(tmp.isStaticString());
-}
-
 TEST(String16Test, StaticStringReplaceAll) {
     StaticString16 tmp(u"Verify verify Verify");
     tmp.replaceAll(u'r', u'!');
diff --git a/libutils/include/utils/String16.h b/libutils/include/utils/String16.h
index 1a4b47eef..5ce48c684 100644
--- a/libutils/include/utils/String16.h
+++ b/libutils/include/utils/String16.h
@@ -85,8 +85,6 @@ public:
 
             bool                contains(const char16_t* chrs) const;
 
-            status_t            makeLower();
-
             status_t            replaceAll(char16_t replaceThis,
                                            char16_t withThis);