diff --git a/clause/where.go b/clause/where.go
index 6399a2d5..f7cd3318 100644
--- a/clause/where.go
+++ b/clause/where.go
@@ -66,7 +66,11 @@ func (and AndConditions) Build(builder Builder) {
 	}
 	for idx, c := range and.Exprs {
 		if idx > 0 {
-			builder.WriteString(" AND ")
+			if orConditions, ok := c.(OrConditions); ok && len(orConditions.Exprs) == 1 {
+				builder.WriteString(" OR ")
+			} else {
+				builder.WriteString(" AND ")
+			}
 		}
 		c.Build(builder)
 	}
diff --git a/clause/where_test.go b/clause/where_test.go
index 95bba820..2fa11d76 100644
--- a/clause/where_test.go
+++ b/clause/where_test.go
@@ -53,6 +53,12 @@ func TestWhere(t *testing.T) {
 			}},
 			"SELECT * FROM `users` WHERE (`users`.`id` <> ? AND `age` <= ?) OR `name` <> ? AND (`score` <= ? OR `name` LIKE ?)", []interface{}{"1", 18, "jinzhu", 100, "%linus%"},
 		},
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.Where{
+				Exprs: []clause.Expression{clause.And(clause.Eq{Column: "age", Value: 18}, clause.Or(clause.Neq{Column: "name", Value: "jinzhu"}))},
+			}},
+			"SELECT * FROM `users` WHERE (`age` = ? OR `name` <> ?)", []interface{}{18, "jinzhu"},
+		},
 	}
 
 	for idx, result := range results {
diff --git a/statement.go b/statement.go
index e3c882ee..7cc01bb8 100644
--- a/statement.go
+++ b/statement.go
@@ -245,6 +245,14 @@ func (stmt *Statement) BuildCondition(query interface{}, args ...interface{}) (c
 		switch v := arg.(type) {
 		case clause.Expression:
 			conds = append(conds, v)
+		case *DB:
+			if cs, ok := v.Statement.Clauses["WHERE"]; ok {
+				if where, ok := cs.Expression.(clause.Where); ok {
+					conds = append(conds, clause.And(where.Exprs...))
+				} else if cs.Expression != nil {
+					conds = append(conds, cs.Expression)
+				}
+			}
 		case map[interface{}]interface{}:
 			for i, j := range v {
 				conds = append(conds, clause.Eq{Column: i, Value: j})
diff --git a/tests/sql_builder_test.go b/tests/sql_builder_test.go
index a60514c9..b78c2484 100644
--- a/tests/sql_builder_test.go
+++ b/tests/sql_builder_test.go
@@ -1,6 +1,7 @@
 package tests_test
 
 import (
+	"strings"
 	"testing"
 
 	"gorm.io/gorm"
@@ -138,3 +139,27 @@ func TestDryRun(t *testing.T) {
 		t.Errorf("Failed to generate sql, got %v", stmt2.SQL.String())
 	}
 }
+
+func TestGroupConditions(t *testing.T) {
+	type Pizza struct {
+		ID   uint
+		Name string
+		Size string
+	}
+	dryRunDB := DB.Session(&gorm.Session{DryRun: true})
+
+	stmt := dryRunDB.Where(
+		DB.Where("pizza = ?", "pepperoni").Where(DB.Where("size = ?", "small").Or("size = ?", "medium")),
+	).Or(
+		DB.Where("pizza = ?", "hawaiian").Where("size = ?", "xlarge"),
+	).Find(&Pizza{}).Statement
+
+	execStmt := dryRunDB.Exec("WHERE (pizza = ? AND (size = ? OR size = ?)) OR (pizza = ? AND size = ?)", "pepperoni", "small", "medium", "hawaiian", "xlarge").Statement
+
+	result := DB.Dialector.Explain(stmt.SQL.String(), stmt.Vars...)
+	expects := DB.Dialector.Explain(execStmt.SQL.String(), execStmt.Vars...)
+
+	if !strings.HasSuffix(result, expects) {
+		t.Errorf("expects: %v, got %v", expects, result)
+	}
+}