diff --git a/compiler-rt/CMakeLists.txt b/compiler-rt/CMakeLists.txt
--- a/compiler-rt/CMakeLists.txt
+++ b/compiler-rt/CMakeLists.txt
@@ -52,25 +52,6 @@
 option(COMPILER_RT_BUILD_GWP_ASAN "Build GWP-ASan, and link it into SCUDO" ON)
 mark_as_advanced(COMPILER_RT_BUILD_GWP_ASAN)
 
-set(COMPILER_RT_ASAN_SHADOW_SCALE ""
-    CACHE STRING "Override the shadow scale to be used in ASan runtime")
-
-if (NOT COMPILER_RT_ASAN_SHADOW_SCALE STREQUAL "")
-  # Check that the shadow scale value is valid.
-  if (NOT (COMPILER_RT_ASAN_SHADOW_SCALE GREATER -1 AND
-           COMPILER_RT_ASAN_SHADOW_SCALE LESS 8))
-    message(FATAL_ERROR "
-      Invalid ASan Shadow Scale '${COMPILER_RT_ASAN_SHADOW_SCALE}'.")
-  endif()
-
-  set(COMPILER_RT_ASAN_SHADOW_SCALE_LLVM_FLAG
-      -mllvm -asan-mapping-scale=${COMPILER_RT_ASAN_SHADOW_SCALE})
-  set(COMPILER_RT_ASAN_SHADOW_SCALE_DEFINITION
-      ASAN_SHADOW_SCALE=${COMPILER_RT_ASAN_SHADOW_SCALE})
-  set(COMPILER_RT_ASAN_SHADOW_SCALE_FLAG
-      -D${COMPILER_RT_ASAN_SHADOW_SCALE_DEFINITION})
-endif()
-
 if(FUCHSIA)
   set(COMPILER_RT_HWASAN_WITH_INTERCEPTORS_DEFAULT OFF)
 else()
diff --git a/compiler-rt/lib/asan/asan_mapping.h b/compiler-rt/lib/asan/asan_mapping.h
--- a/compiler-rt/lib/asan/asan_mapping.h
+++ b/compiler-rt/lib/asan/asan_mapping.h
@@ -151,14 +151,9 @@
 // || `[0x30000000, 0x35ffffff]` || LowShadow  ||
 // || `[0x00000000, 0x2fffffff]` || LowMem     ||
 
-#if defined(ASAN_SHADOW_SCALE)
-static const u64 kDefaultShadowScale = ASAN_SHADOW_SCALE;
-#else
-static const u64 kDefaultShadowScale = 3;
-#endif
-static const u64 kDefaultShadowSentinel = ~(uptr)0;
+#define SHADOW_SCALE 3
 
-#define SHADOW_SCALE kDefaultShadowScale
+static const u64 kDefaultShadowSentinel = ~(uptr)0;
 
 #if SANITIZER_FUCHSIA
 #  define SHADOW_OFFSET_CONST (0)
diff --git a/compiler-rt/lib/asan/tests/CMakeLists.txt b/compiler-rt/lib/asan/tests/CMakeLists.txt
--- a/compiler-rt/lib/asan/tests/CMakeLists.txt
+++ b/compiler-rt/lib/asan/tests/CMakeLists.txt
@@ -23,7 +23,6 @@
 set(ASAN_UNITTEST_COMMON_CFLAGS
   ${COMPILER_RT_UNITTEST_CFLAGS}
   ${COMPILER_RT_GTEST_CFLAGS}
-  ${COMPILER_RT_ASAN_SHADOW_SCALE_LLVM_FLAG}
   -I${COMPILER_RT_SOURCE_DIR}/include
   -I${COMPILER_RT_SOURCE_DIR}/lib
   -I${COMPILER_RT_SOURCE_DIR}/lib/asan
@@ -52,7 +51,6 @@
 
 # Use -D instead of definitions to please custom compile command.
 list(APPEND ASAN_UNITTEST_COMMON_CFLAGS
-  ${COMPILER_RT_ASAN_SHADOW_SCALE_FLAG}
   -DASAN_HAS_IGNORELIST=1
   -DASAN_HAS_EXCEPTIONS=1
   -DASAN_UAR=0
diff --git a/compiler-rt/lib/asan/tests/asan_interface_test.cpp b/compiler-rt/lib/asan/tests/asan_interface_test.cpp
--- a/compiler-rt/lib/asan/tests/asan_interface_test.cpp
+++ b/compiler-rt/lib/asan/tests/asan_interface_test.cpp
@@ -160,7 +160,6 @@
 #define BAD_ACCESS(ptr, offset) \
     EXPECT_TRUE(__asan_address_is_poisoned(ptr + offset))
 
-#if !defined(ASAN_SHADOW_SCALE) || ASAN_SHADOW_SCALE == 3
 static const char* kUseAfterPoisonErrorMessage = "use-after-poison";
 
 TEST(AddressSanitizerInterface, SimplePoisonMemoryRegionTest) {
@@ -200,7 +199,6 @@
   BAD_ACCESS(array, 96);
   free(array);
 }
-#endif  // !defined(ASAN_SHADOW_SCALE) || ASAN_SHADOW_SCALE == 3
 
 TEST(AddressSanitizerInterface, PushAndPopWithPoisoningTest) {
   // Vector of capacity 20