diff --git a/compiler-rt/test/hwasan/TestCases/Linux/aligned_alloc-alignment.cc b/compiler-rt/test/hwasan/TestCases/Linux/aligned_alloc-alignment.cpp
similarity index 100%
rename from compiler-rt/test/hwasan/TestCases/Linux/aligned_alloc-alignment.cc
rename to compiler-rt/test/hwasan/TestCases/Linux/aligned_alloc-alignment.cpp
diff --git a/compiler-rt/test/hwasan/TestCases/Linux/pvalloc-overflow.cc b/compiler-rt/test/hwasan/TestCases/Linux/pvalloc-overflow.cpp
similarity index 100%
rename from compiler-rt/test/hwasan/TestCases/Linux/pvalloc-overflow.cc
rename to compiler-rt/test/hwasan/TestCases/Linux/pvalloc-overflow.cpp
diff --git a/compiler-rt/test/hwasan/TestCases/Posix/posix_memalign-alignment.cc b/compiler-rt/test/hwasan/TestCases/Posix/posix_memalign-alignment.cpp
similarity index 100%
rename from compiler-rt/test/hwasan/TestCases/Posix/posix_memalign-alignment.cc
rename to compiler-rt/test/hwasan/TestCases/Posix/posix_memalign-alignment.cpp
diff --git a/compiler-rt/test/hwasan/TestCases/Posix/system-allocator-fallback.cc b/compiler-rt/test/hwasan/TestCases/Posix/system-allocator-fallback.cpp
similarity index 100%
rename from compiler-rt/test/hwasan/TestCases/Posix/system-allocator-fallback.cc
rename to compiler-rt/test/hwasan/TestCases/Posix/system-allocator-fallback.cpp