diff --git a/compiler-rt/lib/scudo/scudo_allocator.h b/compiler-rt/lib/scudo/scudo_allocator.h
--- a/compiler-rt/lib/scudo/scudo_allocator.h
+++ b/compiler-rt/lib/scudo/scudo_allocator.h
@@ -107,11 +107,13 @@
 #endif  // SANITIZER_CAN_USE_ALLOCATOR64
 
 #include "scudo_allocator_secondary.h"
-#include "scudo_allocator_combined.h"
 
 typedef LargeMmapAllocator SecondaryT;
-typedef CombinedAllocator<PrimaryT, SecondaryT> BackendT;
-typedef BackendT::AllocatorCache AllocatorCacheT;
+
+#include "scudo_allocator_combined.h"
+
+typedef CombinedAllocator BackendT;
+typedef CombinedAllocator::AllocatorCache AllocatorCacheT;
 
 void initScudo();
 
diff --git a/compiler-rt/lib/scudo/scudo_allocator_combined.h b/compiler-rt/lib/scudo/scudo_allocator_combined.h
--- a/compiler-rt/lib/scudo/scudo_allocator_combined.h
+++ b/compiler-rt/lib/scudo/scudo_allocator_combined.h
@@ -18,9 +18,10 @@
 # error "This file must be included inside scudo_allocator.h."
 #endif
 
-template <class PrimaryAllocator, class SecondaryAllocator>
 class CombinedAllocator {
  public:
+  using PrimaryAllocator = PrimaryT;
+  using SecondaryAllocator = SecondaryT;
   using AllocatorCache = typename PrimaryAllocator::AllocatorCache;
   void init(s32 ReleaseToOSIntervalMs) {
     Primary.Init(ReleaseToOSIntervalMs);