diff --git a/compiler-rt/lib/fuzzer/FuzzerLoop.cpp b/compiler-rt/lib/fuzzer/FuzzerLoop.cpp
index 75c2fb71eb070..4ea1fb1507ca4 100644
--- a/compiler-rt/lib/fuzzer/FuzzerLoop.cpp
+++ b/compiler-rt/lib/fuzzer/FuzzerLoop.cpp
@@ -448,9 +448,9 @@ void Fuzzer::PrintPulseAndReportSlowInput(const uint8_t *Data, size_t Size) {
   if (!(TotalNumberOfRuns & (TotalNumberOfRuns - 1)) &&
       secondsSinceProcessStartUp() >= 2)
     PrintStats("pulse ");
-  auto Threshhold =
+  auto Threshold =
       static_cast<long>(static_cast<double>(TimeOfLongestUnitInSeconds) * 1.1);
-  if (TimeOfUnit > Threshhold && TimeOfUnit >= Options.ReportSlowUnits) {
+  if (TimeOfUnit > Threshold && TimeOfUnit >= Options.ReportSlowUnits) {
     TimeOfLongestUnitInSeconds = TimeOfUnit;
     Printf("Slowest unit: %ld s:\n", TimeOfLongestUnitInSeconds);
     WriteUnitToFileWithPrefix({Data, Data + Size}, "slow-unit-");
diff --git a/compiler-rt/lib/fuzzer/FuzzerMutate.cpp b/compiler-rt/lib/fuzzer/FuzzerMutate.cpp
index 1abce16d70d94..41f11a2e48d47 100644
--- a/compiler-rt/lib/fuzzer/FuzzerMutate.cpp
+++ b/compiler-rt/lib/fuzzer/FuzzerMutate.cpp
@@ -413,9 +413,9 @@ size_t ChangeBinaryInteger(uint8_t *Data, size_t Size, Random &Rand) {
     T Add = static_cast<T>(Rand(21));
     Add -= 10;
     if (Rand.RandBool())
-      Val = Bswap(T(Bswap(Val) + Add)); // Add assuming different endiannes.
+      Val = Bswap(T(Bswap(Val) + Add)); // Add assuming different endianness.
     else
-      Val = Val + Add;               // Add assuming current endiannes.
+      Val = Val + Add;               // Add assuming current endianness.
     if (Add == 0 || Rand.RandBool()) // Maybe negate.
       Val = -Val;
   }
diff --git a/compiler-rt/lib/fuzzer/FuzzerUtilWindows.cpp b/compiler-rt/lib/fuzzer/FuzzerUtilWindows.cpp
index 2db2ea98d5c4f..45ee15526b275 100644
--- a/compiler-rt/lib/fuzzer/FuzzerUtilWindows.cpp
+++ b/compiler-rt/lib/fuzzer/FuzzerUtilWindows.cpp
@@ -24,7 +24,7 @@
 // clang-format off
 #include <windows.h>
 // These must be included after windows.h.
-// archicture need to be set before including
+// architecture need to be set before including
 // libloaderapi
 #include <libloaderapi.h>
 #include <stringapiset.h>