diff --git a/core/sys/darwin/mach_darwin.odin b/core/sys/darwin/mach_darwin.odin
index 593a2ee55..7d99e7b86 100644
--- a/core/sys/darwin/mach_darwin.odin
+++ b/core/sys/darwin/mach_darwin.odin
@@ -14,20 +14,20 @@ semaphore_t :: distinct u64
 kern_return_t :: distinct u64
 thread_act_t :: distinct u64
 
-mach_port_t :: c.uint
-vm_map_t :: mach_port_t
-mem_entry_name_port_t :: mach_port_t
+mach_port_t :: distinct c.uint
+vm_map_t :: distinct mach_port_t
+mem_entry_name_port_t :: distinct mach_port_t
 
-vm_size_t :: c.uintptr_t
+vm_size_t :: distinct c.uintptr_t
 
-vm_address_t :: vm_offset_t
-vm_offset_t :: c.uintptr_t
+vm_address_t :: distinct vm_offset_t
+vm_offset_t :: distinct c.uintptr_t
 
-boolean_t :: c.int
+boolean_t :: distinct c.int
 
-vm_prot_t :: c.int
+vm_prot_t :: distinct c.int
 
-vm_inherit_t           :: c.uint
+vm_inherit_t :: distinct c.uint
 
 @(default_calling_convention="c")
 foreign mach {