diff --git a/contracts/coordinator/contracts/src/MixinSignatureValidator.sol b/contracts/coordinator/contracts/src/MixinSignatureValidator.sol
index 25d2dbef94..dd70387710 100644
--- a/contracts/coordinator/contracts/src/MixinSignatureValidator.sol
+++ b/contracts/coordinator/contracts/src/MixinSignatureValidator.sol
@@ -27,20 +27,6 @@ contract MixinSignatureValidator is
 {
     using LibBytes for bytes;
 
-   // Allowed signature types.
-    enum SignatureType {
-        Illegal,                // 0x00, default value
-        Invalid,                // 0x01
-        EIP712,                 // 0x02
-        EthSign,                // 0x03
-        Wallet,                 // 0x04
-        Validator,              // 0x05
-        PreSigned,              // 0x06
-        OrderValidator,         // 0x07
-        WalletOrderValidator,   // 0x08
-        NSignatureTypes         // 0x09, number of signature types. Always leave at end.
-    }
-
     /// @dev Recovers the address of a signer given a hash and signature.
     /// @param hash Any 32 byte hash.
     /// @param signature Proof that the hash has been signed by signer.
diff --git a/contracts/coordinator/contracts/src/interfaces/ISignatureValidator.sol b/contracts/coordinator/contracts/src/interfaces/ISignatureValidator.sol
index 67aca25c85..4315e43027 100644
--- a/contracts/coordinator/contracts/src/interfaces/ISignatureValidator.sol
+++ b/contracts/coordinator/contracts/src/interfaces/ISignatureValidator.sol
@@ -21,6 +21,20 @@ pragma solidity ^0.5.9;
 
 contract ISignatureValidator {
 
+   // Allowed signature types.
+    enum SignatureType {
+        Illegal,                // 0x00, default value
+        Invalid,                // 0x01
+        EIP712,                 // 0x02
+        EthSign,                // 0x03
+        Wallet,                 // 0x04
+        Validator,              // 0x05
+        PreSigned,              // 0x06
+        OrderValidator,         // 0x07
+        WalletOrderValidator,   // 0x08
+        NSignatureTypes         // 0x09, number of signature types. Always leave at end.
+    }
+
     /// @dev Recovers the address of a signer given a hash and signature.
     /// @param hash Any 32 byte hash.
     /// @param signature Proof that the hash has been signed by signer.
diff --git a/contracts/exchange/contracts/src/MixinExchangeCore.sol b/contracts/exchange/contracts/src/MixinExchangeCore.sol
index 7e1464b759..a31ae6be77 100644
--- a/contracts/exchange/contracts/src/MixinExchangeCore.sol
+++ b/contracts/exchange/contracts/src/MixinExchangeCore.sol
@@ -15,7 +15,6 @@
   limitations under the License.
 
 */
-
 pragma solidity ^0.5.9;
 pragma experimental ABIEncoderV2;