diff --git a/libutils/String8.cpp b/libutils/String8.cpp
index fad130b..2974aa3 100644
--- a/libutils/String8.cpp
+++ b/libutils/String8.cpp
@@ -426,19 +426,6 @@
     unlockBuffer(length);
 }
 
-void String8::toUpper()
-{
-    const size_t length = size();
-    if (length == 0) return;
-
-    char* buf = lockBuffer(length);
-    for (size_t i = length; i > 0; --i) {
-        *buf = static_cast<char>(toupper(*buf));
-        buf++;
-    }
-    unlockBuffer(length);
-}
-
 // ---------------------------------------------------------------------------
 // Path functions
 
diff --git a/libutils/String8_fuzz.cpp b/libutils/String8_fuzz.cpp
index b02683c..a45d675 100644
--- a/libutils/String8_fuzz.cpp
+++ b/libutils/String8_fuzz.cpp
@@ -42,9 +42,6 @@
 
                 // Casing
                 [](FuzzedDataProvider*, android::String8* str1, android::String8*) -> void {
-                    str1->toUpper();
-                },
-                [](FuzzedDataProvider*, android::String8* str1, android::String8*) -> void {
                     str1->toLower();
                 },
                 [](FuzzedDataProvider*, android::String8* str1, android::String8* str2) -> void {
diff --git a/libutils/include/utils/String8.h b/libutils/include/utils/String8.h
index 84f14d0..cee5dc6 100644
--- a/libutils/include/utils/String8.h
+++ b/libutils/include/utils/String8.h
@@ -130,7 +130,6 @@
             bool                removeAll(const char* other);
 
             void                toLower();
-            void                toUpper();
 
 
     /*