diff --git a/core/src/main/java/org/apache/calcite/rex/RexBuilder.java b/core/src/main/java/org/apache/calcite/rex/RexBuilder.java
index 4eb443fa3e9..aab7a244cef 100644
--- a/core/src/main/java/org/apache/calcite/rex/RexBuilder.java
+++ b/core/src/main/java/org/apache/calcite/rex/RexBuilder.java
@@ -39,6 +39,7 @@
 import org.apache.calcite.sql.fun.SqlStdOperatorTable;
 import org.apache.calcite.sql.parser.SqlParserPos;
 import org.apache.calcite.sql.type.ArraySqlType;
+import org.apache.calcite.sql.type.IntervalSqlType;
 import org.apache.calcite.sql.type.MapSqlType;
 import org.apache.calcite.sql.type.MultisetSqlType;
 import org.apache.calcite.sql.type.SqlTypeFamily;
@@ -1336,8 +1337,14 @@ protected RexLiteral makeLiteral(
       o = ((TimestampWithTimeZoneString) o).round(p);
       break;
     case DECIMAL:
-      if (o != null && type.getScale() != RelDataType.SCALE_NOT_SPECIFIED) {
-        assert o instanceof BigDecimal;
+      if (o == null)
+        break;
+      assert o instanceof BigDecimal;
+      if (type instanceof IntervalSqlType) {
+        o = ((BigDecimal) o).multiply(
+            ((IntervalSqlType) type).getIntervalQualifier().getUnit().multiplier);
+        typeName = type.getSqlTypeName();
+      } else if (type.getScale() != RelDataType.SCALE_NOT_SPECIFIED) {
         o = ((BigDecimal) o).setScale(type.getScale(), typeFactory.getTypeSystem().roundingMode());
         if (type.getScale() < 0) {
           o = new BigDecimal(((BigDecimal) o).toPlainString());
diff --git a/testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java b/testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java
index 9c0cd589c1a..f04c02c61a9 100644
--- a/testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java
+++ b/testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java
@@ -1000,6 +1000,10 @@ void testCastToInterval(CastType castType, SqlOperatorFixture f) {
         "cast(-5723 as interval minute(4))",
         "-5723",
         "INTERVAL MINUTE(4) NOT NULL");
+    f.checkScalar(
+        "cast(cast(1 as integer) as interval minute)",
+        "+1",
+        "INTERVAL MINUTE NOT NULL");
   }
 
   @ParameterizedTest