diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3e92fea92aa..1df5346f190 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -38,8 +38,10 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Bug Fixes
 
+* (modules/light-clients/06-solomachine) [\#122](https://github.com/cosmos/ibc-go/pull/122) Fix solo machine merkle prefix casting bug. 
 * (modules/light-clients/06-solomachine) [\#120](https://github.com/cosmos/ibc-go/pull/120) Fix solo machine handshake verification bug. 
 
+
 ### API Breaking
 
 * (modules/core) [\#109](https://github.com/cosmos/ibc-go/pull/109) Remove connection and channel handshake CLI commands.
diff --git a/modules/light-clients/06-solomachine/spec/01_concepts.md b/modules/light-clients/06-solomachine/spec/01_concepts.md
index de486b71b1a..a121803f43c 100644
--- a/modules/light-clients/06-solomachine/spec/01_concepts.md
+++ b/modules/light-clients/06-solomachine/spec/01_concepts.md
@@ -108,6 +108,9 @@ timestampedSignatureData := &types.TimestampedSignatureData{
 proof, err := cdc.MarshalBinaryBare(timestampedSignatureData)
 ```
 
+NOTE: At the end of this process, the sequence associated with the key needs to be updated. 
+The sequence must be incremented each time proof is generated. 
+
 ## Updates By Header
 
 An update by a header will only succeed if:
diff --git a/modules/light-clients/06-solomachine/types/client_state.go b/modules/light-clients/06-solomachine/types/client_state.go
index c208e23b333..efa740cab6a 100644
--- a/modules/light-clients/06-solomachine/types/client_state.go
+++ b/modules/light-clients/06-solomachine/types/client_state.go
@@ -435,7 +435,7 @@ func produceVerificationArgs(
 		return nil, nil, 0, 0, sdkerrors.Wrap(commitmenttypes.ErrInvalidPrefix, "prefix cannot be empty")
 	}
 
-	_, ok := prefix.(commitmenttypes.MerklePrefix)
+	_, ok := prefix.(*commitmenttypes.MerklePrefix)
 	if !ok {
 		return nil, nil, 0, 0, sdkerrors.Wrapf(commitmenttypes.ErrInvalidPrefix, "invalid prefix type %T, expected MerklePrefix", prefix)
 	}
diff --git a/modules/light-clients/06-solomachine/types/client_state_test.go b/modules/light-clients/06-solomachine/types/client_state_test.go
index 6c7661ef629..654ab1baf19 100644
--- a/modules/light-clients/06-solomachine/types/client_state_test.go
+++ b/modules/light-clients/06-solomachine/types/client_state_test.go
@@ -19,7 +19,9 @@ const (
 )
 
 var (
-	prefix          = commitmenttypes.NewMerklePrefix([]byte("ibc"))
+	prefix = &commitmenttypes.MerklePrefix{
+		KeyPrefix: []byte("ibc"),
+	}
 	consensusHeight = clienttypes.ZeroHeight()
 )
 
@@ -387,7 +389,7 @@ func (suite *SoloMachineTestSuite) TestVerifyClientConsensusState() {
 }
 
 func (suite *SoloMachineTestSuite) TestVerifyConnectionState() {
-	counterparty := connectiontypes.NewCounterparty("clientB", testConnectionID, prefix)
+	counterparty := connectiontypes.NewCounterparty("clientB", testConnectionID, *prefix)
 	conn := connectiontypes.NewConnectionEnd(connectiontypes.OPEN, "clientA", counterparty, connectiontypes.ExportedVersionsToProto(connectiontypes.GetCompatibleVersions()), 0)
 
 	path := suite.solomachine.GetConnectionStatePath(testConnectionID)
diff --git a/modules/light-clients/06-solomachine/types/codec_test.go b/modules/light-clients/06-solomachine/types/codec_test.go
index d4589be6a43..e635cb8c65f 100644
--- a/modules/light-clients/06-solomachine/types/codec_test.go
+++ b/modules/light-clients/06-solomachine/types/codec_test.go
@@ -67,7 +67,7 @@ func (suite SoloMachineTestSuite) TestUnmarshalDataByType() {
 			},
 			{
 				"connection", types.CONNECTION, func() {
-					counterparty := connectiontypes.NewCounterparty("clientB", testConnectionID, prefix)
+					counterparty := connectiontypes.NewCounterparty("clientB", testConnectionID, *prefix)
 					conn := connectiontypes.NewConnectionEnd(connectiontypes.OPEN, "clientA", counterparty, connectiontypes.ExportedVersionsToProto(connectiontypes.GetCompatibleVersions()), 0)
 					path := solomachine.GetConnectionStatePath("connectionID")
 
@@ -98,7 +98,7 @@ func (suite SoloMachineTestSuite) TestUnmarshalDataByType() {
 			},
 			{
 				"bad channel (uses connection data)", types.CHANNEL, func() {
-					counterparty := connectiontypes.NewCounterparty("clientB", testConnectionID, prefix)
+					counterparty := connectiontypes.NewCounterparty("clientB", testConnectionID, *prefix)
 					conn := connectiontypes.NewConnectionEnd(connectiontypes.OPEN, "clientA", counterparty, connectiontypes.ExportedVersionsToProto(connectiontypes.GetCompatibleVersions()), 0)
 					path := solomachine.GetConnectionStatePath("connectionID")