diff --git a/protocol/x/affiliates/keeper/keeper.go b/protocol/x/affiliates/keeper/keeper.go
index 92554b8f1c..52cb1bfd3a 100644
--- a/protocol/x/affiliates/keeper/keeper.go
+++ b/protocol/x/affiliates/keeper/keeper.go
@@ -61,6 +61,12 @@ func (k Keeper) RegisterAffiliate(
 	referee string,
 	affiliateAddr string,
 ) error {
+	if referee == affiliateAddr {
+		return errorsmod.Wrapf(
+			types.ErrSelfReferral, "referee: %s, affiliate: %s",
+			referee, affiliateAddr,
+		)
+	}
 	if _, err := sdk.AccAddressFromBech32(referee); err != nil {
 		return errorsmod.Wrapf(types.ErrInvalidAddress, "referee: %s", referee)
 	}
diff --git a/protocol/x/affiliates/keeper/keeper_test.go b/protocol/x/affiliates/keeper/keeper_test.go
index 7a417cbdd6..5a889d1f9d 100644
--- a/protocol/x/affiliates/keeper/keeper_test.go
+++ b/protocol/x/affiliates/keeper/keeper_test.go
@@ -88,6 +88,15 @@ func TestRegisterAffiliate_GetReferredBy(t *testing.T) {
 				// No setup needed for this test case
 			},
 		},
+		{
+			name:        "Self referral",
+			referee:     constants.AliceAccAddress.String(),
+			affiliate:   constants.AliceAccAddress.String(),
+			expectError: types.ErrSelfReferral,
+			setup: func(t *testing.T, ctx sdk.Context, k *keeper.Keeper) {
+				// No setup needed for this test case
+			},
+		},
 	}
 
 	for _, tc := range tests {
diff --git a/protocol/x/affiliates/types/errors.go b/protocol/x/affiliates/types/errors.go
index ed8a2062d3..a60b522930 100644
--- a/protocol/x/affiliates/types/errors.go
+++ b/protocol/x/affiliates/types/errors.go
@@ -16,4 +16,5 @@ var (
 		ModuleName, 8, "Duplicate affiliate address for whitelist")
 	ErrAffiliateTiersNotSet = errorsmod.Register(ModuleName, 9,
 		"Affiliate tiers not set (affiliate program is not active)")
+	ErrSelfReferral = errorsmod.Register(ModuleName, 10, "Self referral not allowed")
 )