diff --git a/lib/SIL/Verifier/SILVerifier.cpp b/lib/SIL/Verifier/SILVerifier.cpp
index 0c8bf89d17c7c..e08f02c68e998 100644
--- a/lib/SIL/Verifier/SILVerifier.cpp
+++ b/lib/SIL/Verifier/SILVerifier.cpp
@@ -1657,7 +1657,11 @@ class SILVerifier : public SILVerifierBase<SILVerifier> {
 
       require(lhs == rhs ||
               (lhs.isAddress() && lhs.getObjectType() == rhs) ||
-              (DebugVarTy.isAddress() && lhs == rhs.getObjectType()),
+              (DebugVarTy.isAddress() && lhs == rhs.getObjectType()) ||
+
+              // When cloning SIL (e.g. in LoopUnroll) local archetypes are uniqued
+              // and therefore distinct in cloned instructions.
+              (lhs.hasLocalArchetype() && rhs.hasLocalArchetype()),
               "Two variables with different type but same scope!");
     }
 
diff --git a/test/SIL/verifier-archetype-debugvars.sil b/test/SIL/verifier-archetype-debugvars.sil
new file mode 100644
index 0000000000000..c651d216b19c6
--- /dev/null
+++ b/test/SIL/verifier-archetype-debugvars.sil
@@ -0,0 +1,27 @@
+// RUN: %target-sil-opt %s
+
+sil_stage canonical
+
+import Builtin
+import Swift
+import SwiftShims
+
+protocol P {}
+
+sil_scope 2 { loc "test.swift":1:6 parent @testit : $@convention(thin) (@in_guaranteed any P) -> () }
+sil_scope 3 { loc "test.swift":2:7 parent 2 }
+
+// Check that the verifier does not complain about two alloc_stacks with the same variable but different existential archetypes.
+
+sil @testit : $@convention(thin) (@in_guaranteed any P) -> () {
+bb0(%0 : $*any P):
+  %1 = open_existential_addr immutable_access %0 to $*@opened("2A0E9166-A9AC-11F0-A5A7-0EA13E3AABAF", any P) Self 
+  %2 = alloc_stack [lexical] $@opened("2A0E9166-A9AC-11F0-A5A7-0EA13E3AABAF", any P) Self, var, name "x", loc "test.swift":2:7, scope 3
+  dealloc_stack %2
+  %4 = open_existential_addr immutable_access %0 to $*@opened("3A0E9166-A9AC-11F0-A5A7-0EA13E3AABAF", any P) Self 
+  %5 = alloc_stack [lexical] $@opened("3A0E9166-A9AC-11F0-A5A7-0EA13E3AABAF", any P) Self, var, name "x", loc "test.swift":2:7, scope 3
+  dealloc_stack %5
+  %r = tuple ()
+  return %r
+}
+