diff --git a/clang/include/clang/Basic/BuiltinsAssigner.def b/clang/include/clang/Basic/BuiltinsAssigner.def
index b6a2c11d9d49..4a0303f8a003 100644
--- a/clang/include/clang/Basic/BuiltinsAssigner.def
+++ b/clang/include/clang/Basic/BuiltinsAssigner.def
@@ -39,7 +39,7 @@
 // numbers: https://github.com/NilFoundation/zkllvm-circifier/blob/master/clang/lib/AST/ASTContext.cpp#L11086-L11118
 BUILTIN(__builtin_assigner_malloc, "v*z", "n")
 BUILTIN(__builtin_assigner_free, "vv*", "n")
-BUILTIN(__builtin_assigner_poseidon_pallas_base, "E3g1E3g1", "n")
+BUILTIN(__builtin_assigner_poseidon_pallas_base, "g1g1g1", "n")
 BUILTIN(__builtin_assigner_sha2_256_pallas_base, "E2g1E2g1E2g1", "n")
 BUILTIN(__builtin_assigner_sha2_256_bls12381_base, "g3g3", "n")
 BUILTIN(__builtin_assigner_sha2_512_curve25519, "g6e4e4E4g1", "n")
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 9212ab5b8458..b06d8f021aa0 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -20570,7 +20570,7 @@ Value *CodeGenFunction::EmitAssignerBuiltinExpr(unsigned int BuiltinID,
     ID = Intrinsic::assigner_poseidon;
     auto ElemTy = llvm::GaloisFieldType::get(context,
                                              llvm::GALOIS_FIELD_PALLAS_BASE);
-    OverloadTypes = {llvm::FixedVectorType::get(ElemTy, 3)};
+    OverloadTypes = {ElemTy};
     break;
   }
   case assigner::BI__builtin_assigner_sha2_256_pallas_base: {
diff --git a/llvm/include/llvm/IR/IntrinsicsAssigner.td b/llvm/include/llvm/IR/IntrinsicsAssigner.td
index 24305a28d5b1..20100a1df28b 100644
--- a/llvm/include/llvm/IR/IntrinsicsAssigner.td
+++ b/llvm/include/llvm/IR/IntrinsicsAssigner.td
@@ -12,7 +12,7 @@
 
 def int_assigner_malloc:    Intrinsic<[llvm_ptr_ty], [llvm_i64_ty]>;
 def int_assigner_free:      Intrinsic<[], [llvm_ptr_ty]>;
-def int_assigner_poseidon:  Intrinsic<[llvm_anyvector_ty], [LLVMMatchType<0>]>;
+def int_assigner_poseidon:  Intrinsic<[llvm_any_ty], [LLVMMatchType<0>, LLVMMatchType<0>]>;
 def int_assigner_sha2_256:  Intrinsic<[llvm_anyvector_ty], [LLVMMatchType<0>, LLVMMatchType<0>]>;
 def int_assigner_sha2_256_bls12381:   Intrinsic<[llvm_any_ty], [LLVMMatchType<0>]>;
 def int_assigner_sha2_512:  Intrinsic<[llvm_any_ty], [llvm_any_ty, LLVMMatchType<1>, llvm_anyvector_ty]>;