diff --git a/vlib/builtin/cfns.c.v b/vlib/builtin/cfns.c.v
index 4bb62737bd..007fd20795 100644
--- a/vlib/builtin/cfns.c.v
+++ b/vlib/builtin/cfns.c.v
@@ -227,7 +227,7 @@ fn C.sysctl(name &int, namelen u32, oldp voidptr, oldlenp voidptr, newp voidptr,
 [trusted]
 fn C._fileno(int) int
 
-struct C.intptr_t {}
+type C.intptr_t = voidptr
 
 fn C._get_osfhandle(fd int) C.intptr_t
 
diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index e5f2a22353..c8468a927e 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -499,10 +499,9 @@ fn (mut c Checker) type_decl(node ast.TypeDecl) {
 }
 
 fn (mut c Checker) alias_type_decl(node ast.AliasTypeDecl) {
-	// TODO Remove when `u8` isn't an alias in builtin anymore
-	// if c.file.mod.name != 'builtin' {
-	// c.check_valid_pascal_case(node.name, 'type alias', node.pos)
-	//}
+	if c.file.mod.name != 'builtin' && c.file.mod.name != 'time' {
+		c.check_valid_pascal_case(node.name, 'type alias', node.pos)
+	}
 	if !c.ensure_type_exists(node.parent_type, node.type_pos) {
 		return
 	}