diff --git a/src/globals.h b/src/globals.h
index d7887bb..39ef83e 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -403,6 +403,7 @@
 EXTERN type_T t_bool INIT6(VAR_BOOL, 0, 0, TTFLAG_STATIC, NULL, NULL);
 EXTERN type_T t_special INIT6(VAR_SPECIAL, 0, 0, TTFLAG_STATIC, NULL, NULL);
 EXTERN type_T t_number INIT6(VAR_NUMBER, 0, 0, TTFLAG_STATIC, NULL, NULL);
+EXTERN type_T t_number_bool INIT6(VAR_NUMBER, 0, 0, TTFLAG_STATIC|TTFLAG_BOOL_OK, NULL, NULL);
 EXTERN type_T t_float INIT6(VAR_FLOAT, 0, 0, TTFLAG_STATIC, NULL, NULL);
 EXTERN type_T t_string INIT6(VAR_STRING, 0, 0, TTFLAG_STATIC, NULL, NULL);
 EXTERN type_T t_blob INIT6(VAR_BLOB, 0, 0, TTFLAG_STATIC, NULL, NULL);
diff --git a/src/version.c b/src/version.c
index ba291af..018bfd5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2210,
+/**/
     2209,
 /**/
     2208,
diff --git a/src/vim9compile.c b/src/vim9compile.c
index fdc805b..53a6105 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -931,17 +931,8 @@
     isn->isn_arg.number = number;
 
     if (number == 0 || number == 1)
-    {
-	type_T	*type = get_type_ptr(cctx->ctx_type_list);
-
 	// A 0 or 1 number can also be used as a bool.
-	if (type != NULL)
-	{
-	    type->tt_type = VAR_NUMBER;
-	    type->tt_flags = TTFLAG_BOOL_OK;
-	    ((type_T **)stack->ga_data)[stack->ga_len - 1] = type;
-	}
-    }
+	((type_T **)stack->ga_data)[stack->ga_len - 1] = &t_number_bool;
     return OK;
 }
 
diff --git a/src/vim9type.c b/src/vim9type.c
index 4ea32a7..7d8df69 100644
--- a/src/vim9type.c
+++ b/src/vim9type.c
@@ -376,18 +376,9 @@
     if (type != NULL && type != &t_bool
 	    && (tv->v_type == VAR_NUMBER
 		    && (tv->vval.v_number == 0 || tv->vval.v_number == 1)))
-    {
-	type_T *newtype = get_type_ptr(type_gap);
-
-	// Number 0 and 1 and expression with "&&" or "||" can also be used
-	// for bool.
-	if (newtype != NULL)
-	{
-	    *newtype = *type;
-	    newtype->tt_flags = TTFLAG_BOOL_OK;
-	    type = newtype;
-	}
-    }
+	// Number 0 and 1 and expression with "&&" or "||" can also be used for
+	// bool.
+	type = &t_number_bool;
     return type;
 }