diff --git a/compiler-rt/lib/scudo/standalone/CMakeLists.txt b/compiler-rt/lib/scudo/standalone/CMakeLists.txt
--- a/compiler-rt/lib/scudo/standalone/CMakeLists.txt
+++ b/compiler-rt/lib/scudo/standalone/CMakeLists.txt
@@ -11,6 +11,7 @@
   -Werror=conversion
   -Wall
   -g
+  -std=c++17  # For consistency with unit-tetests only.
   -nostdinc++)
 
 # Remove -stdlib= which is unused when passing -nostdinc++.
diff --git a/compiler-rt/lib/scudo/standalone/tests/CMakeLists.txt b/compiler-rt/lib/scudo/standalone/tests/CMakeLists.txt
--- a/compiler-rt/lib/scudo/standalone/tests/CMakeLists.txt
+++ b/compiler-rt/lib/scudo/standalone/tests/CMakeLists.txt
@@ -14,6 +14,7 @@
   -DGTEST_HAS_RTTI=0
   -DSCUDO_DEBUG=1
   -g
+  -std=c++17  # Required for "new" for "alignas" types.
   # Extra flags for the C++ tests
   # TODO(kostyak): find a way to make -fsized-deallocation work
   -Wno-mismatched-new-delete)