diff --git a/ethosu/regor/architecture/architecture_constraints.hpp b/ethosu/regor/architecture/architecture_constraints.hpp
index dc6dd867b7fc74ab6d34bd026b06ca84489531e7..2eed6e266c456a84fa8ebc4ca147d74101bbd478 100644
--- a/ethosu/regor/architecture/architecture_constraints.hpp
+++ b/ethosu/regor/architecture/architecture_constraints.hpp
@@ -132,11 +132,6 @@ public:
     virtual bool SupportsElementwiseLeakyRelu(bool quantized, DataType type) = 0;
     virtual bool SupportsRescale(DataType fromType, DataType toType) = 0;
     virtual Flags<QueryResult> OperatorQuery(OpType opType, const ArchOperatorQuery *query = nullptr, ArchRequirements *req = nullptr) = 0;
-
-private:
-    virtual bool SupportedDtypes(OpType opType, DataType ifmType, DataType ifm2Type, DataType ofmType) = 0;
-    virtual bool SupportsFusedReverse(OpType opType, ReverseType reverseTypeMask) = 0;
-    virtual TransposeSupport SupportsFusedTranspose(OpType opType, TransposeType transposeType) = 0;
 };
 
 }  // namespace regor
diff --git a/ethosu/regor/architecture/ethosu55/ethos_u55_constraints.hpp b/ethosu/regor/architecture/ethosu55/ethos_u55_constraints.hpp
index 045c18a5ebfacc73b68389e027d5c102d8084ad0..3ae01c3ba255d613d32e0bf3899ef3351067a55e 100644
--- a/ethosu/regor/architecture/ethosu55/ethos_u55_constraints.hpp
+++ b/ethosu/regor/architecture/ethosu55/ethos_u55_constraints.hpp
@@ -38,10 +38,10 @@ public:
     bool SupportsRescale(DataType fromType, DataType toType) override;
     Flags<QueryResult> OperatorQuery(OpType opType, const ArchOperatorQuery *query, ArchRequirements *req) override;
 
-protected:
-    bool SupportedDtypes(OpType opType, DataType ifmType, DataType ifm2Type, DataType ofmType) override;
-    bool SupportsFusedReverse(OpType opType, ReverseType reverseTypeMask) override;
-    TransposeSupport SupportsFusedTranspose(OpType opType, TransposeType transposeType) override;
+private:
+    bool SupportedDtypes(OpType opType, DataType ifmType, DataType ifm2Type, DataType ofmType);
+    bool SupportsFusedReverse(OpType opType, ReverseType reverseTypeMask);
+    TransposeSupport SupportsFusedTranspose(OpType opType, TransposeType transposeType);
 };
 
 }  // namespace regor
diff --git a/ethosu/regor/architecture/ethosu85/ethos_u85_constraints.hpp b/ethosu/regor/architecture/ethosu85/ethos_u85_constraints.hpp
index b682369832c2ea2f1322f5da63dbe6db9f6c4725..66aa057b46620d04745d08fbb6ab26634983fbc2 100644
--- a/ethosu/regor/architecture/ethosu85/ethos_u85_constraints.hpp
+++ b/ethosu/regor/architecture/ethosu85/ethos_u85_constraints.hpp
@@ -29,18 +29,18 @@ private:
 
 public:
     EthosU85Constraints(ArchEthosU85 *arch) : _arch(arch) {}
-    bool SupportsFusedReverse(OpType opType, ReverseType reverseTypeMask) override;
     bool SupportsFusedRescale(OpType opType, TensorUsage tensorUsage, DataType rescaleFromType, DataType rescaleToType,
         DataType opFromType, DataType opToType, const Quantization &quantization) override;
-    TransposeSupport SupportsFusedTranspose(OpType opType, TransposeType transposeType) override;
     bool SupportsAccumulatorSaveRestore() override { return true; }
     bool SupportsNegativeStrides() override { return false; };
     bool SupportsElementwiseLeakyRelu(bool quantized, DataType type) override { return true; };
     bool SupportsRescale(DataType fromType, DataType toType) override;
     Flags<QueryResult> OperatorQuery(OpType opType, const ArchOperatorQuery *query, ArchRequirements *req) override;
 
-protected:
-    bool SupportedDtypes(OpType opType, DataType ifmType, DataType ifm2Type, DataType ofmType) override;
+private:
+    bool SupportedDtypes(OpType opType, DataType ifmType, DataType ifm2Type, DataType ofmType);
+    bool SupportsFusedReverse(OpType opType, ReverseType reverseTypeMask);
+    TransposeSupport SupportsFusedTranspose(OpType opType, TransposeType transposeType);
 };
 
 }  // namespace regor