diff --git a/llvm/lib/Support/NativeFormatting.cpp b/llvm/lib/Support/NativeFormatting.cpp
--- a/llvm/lib/Support/NativeFormatting.cpp
+++ b/llvm/lib/Support/NativeFormatting.cpp
@@ -58,10 +58,7 @@
   static_assert(std::is_unsigned_v<T>, "Value is not unsigned!");
 
   char NumberBuffer[128];
-  std::memset(NumberBuffer, '0', sizeof(NumberBuffer));
-
-  size_t Len = 0;
-  Len = format_to_buffer(N, NumberBuffer);
+  size_t Len = format_to_buffer(N, NumberBuffer);
 
   if (IsNegative)
     S << '-';
diff --git a/llvm/unittests/Support/NativeFormatTests.cpp b/llvm/unittests/Support/NativeFormatTests.cpp
--- a/llvm/unittests/Support/NativeFormatTests.cpp
+++ b/llvm/unittests/Support/NativeFormatTests.cpp
@@ -48,6 +48,8 @@
 TEST(NativeFormatTest, BasicIntegerTests) {
   // Simple integers with no decimal.
   EXPECT_EQ("0", format_number(0, IntegerStyle::Integer));
+  EXPECT_EQ("1", format_number(1, IntegerStyle::Integer));
+  EXPECT_EQ("-1", format_number(-1, IntegerStyle::Integer));
   EXPECT_EQ("2425", format_number(2425, IntegerStyle::Integer));
   EXPECT_EQ("-2425", format_number(-2425, IntegerStyle::Integer));