diff --git a/x/market/types/errors.go b/x/market/types/errors.go
index d46da63..97b43b8 100644
--- a/x/market/types/errors.go
+++ b/x/market/types/errors.go
@@ -64,4 +64,6 @@ var (
 	ErrOrderFilled = sdkerrors.Register(ModuleName, 27, "order already filled") // nolint: gomnd
 	// ErrProductLessThanExpected - product is less than expected
 	ErrProductLessThanExpected = sdkerrors.Register(ModuleName, 28, "product less than expected") // nolint: gomnd
+	// ErrSqrtProdDropRatio - sqrt product over drops ratio inconsistency
+	ErrSqrtProdDropRatio = sdkerrors.Register(ModuleName, 29, "sqrt prod over drop less than expected") // nolint: gomnd
 )