diff --git a/go/vt/vtgate/evalengine/compiler_test.go b/go/vt/vtgate/evalengine/compiler_test.go
index 537fc64be3c..0c0841a848b 100644
--- a/go/vt/vtgate/evalengine/compiler_test.go
+++ b/go/vt/vtgate/evalengine/compiler_test.go
@@ -611,6 +611,10 @@ func TestCompilerSingle(t *testing.T) {
 			expression: `now() + interval 654321 microsecond`,
 			result:     `DATETIME("2023-10-24 12:00:00.654321")`,
 		},
+		{
+			expression: `1 * unix_timestamp(utc_timestamp(1))`,
+			result:     `DECIMAL(1698134400.1)`,
+		},
 	}
 
 	tz, _ := time.LoadLocation("Europe/Madrid")
diff --git a/go/vt/vtgate/evalengine/fn_time.go b/go/vt/vtgate/evalengine/fn_time.go
index fc5c045a407..bdaaaa7e1d2 100644
--- a/go/vt/vtgate/evalengine/fn_time.go
+++ b/go/vt/vtgate/evalengine/fn_time.go
@@ -217,7 +217,7 @@ func (call *builtinNow) compile(c *compiler) (ctype, error) {
 		t = sqltypes.Datetime
 		c.asm.Fn_Now(call.prec, call.utc)
 	}
-	return ctype{Type: t, Col: collationBinary}, nil
+	return ctype{Type: t, Col: collationBinary, Size: int32(call.prec)}, nil
 }
 
 func (call *builtinNow) constant() bool {
@@ -234,7 +234,7 @@ func (call *builtinSysdate) eval(env *ExpressionEnv) (eval, error) {
 
 func (call *builtinSysdate) compile(c *compiler) (ctype, error) {
 	c.asm.Fn_Sysdate(call.prec)
-	return ctype{Type: sqltypes.Datetime, Col: collationBinary}, nil
+	return ctype{Type: sqltypes.Datetime, Col: collationBinary, Size: int32(call.prec)}, nil
 }
 
 func (call *builtinSysdate) constant() bool {