diff --git a/core/sync/extended.odin b/core/sync/extended.odin
index 0878858f2..c76ab504b 100644
--- a/core/sync/extended.odin
+++ b/core/sync/extended.odin
@@ -7,7 +7,7 @@ _ :: vg
 // A Wait_Group waits for a collection of threads to finish
 //
 // A Wait_Group must not be copied after first use
-Wait_Group :: struct {
+Wait_Group :: struct #no_copy {
 	counter: int,
 	mutex:   Mutex,
 	cond:    Cond,
@@ -101,7 +101,7 @@ Example:
 		fmt.println("Finished")
 	}
 */
-Barrier :: struct {
+Barrier :: struct #no_copy {
 	mutex: Mutex,
 	cond:  Cond,
 	index:         int,
@@ -141,7 +141,7 @@ barrier_wait :: proc "contextless" (b: ^Barrier) -> (is_leader: bool) {
 }
 
 
-Auto_Reset_Event :: struct {
+Auto_Reset_Event :: struct #no_copy {
 	// status ==  0: Event is reset and no threads are waiting
 	// status ==  1: Event is signaled
 	// status == -N: Event is reset and N threads are waiting
@@ -172,7 +172,7 @@ auto_reset_event_wait :: proc "contextless" (e: ^Auto_Reset_Event) {
 
 
 
-Ticket_Mutex :: struct {
+Ticket_Mutex :: struct #no_copy {
 	ticket:  uint,
 	serving: uint,
 }
@@ -194,7 +194,7 @@ ticket_mutex_guard :: proc "contextless" (m: ^Ticket_Mutex) -> bool {
 }
 
 
-Benaphore :: struct {
+Benaphore :: struct #no_copy {
 	counter: i32,
 	sema:    Sema,
 }
@@ -222,7 +222,7 @@ benaphore_guard :: proc "contextless" (m: ^Benaphore) -> bool {
 	return true
 }
 
-Recursive_Benaphore :: struct {
+Recursive_Benaphore :: struct #no_copy {
 	counter:   int,
 	owner:     int,
 	recursion: i32,
@@ -284,7 +284,7 @@ recursive_benaphore_guard :: proc "contextless" (m: ^Recursive_Benaphore) -> boo
 // Once is a data value that will perform exactly on action.
 // 
 // A Once must not be copied after first use.
-Once :: struct {
+Once :: struct #no_copy {
 	m:    Mutex,
 	done: bool,
 }
@@ -372,7 +372,7 @@ once_do_with_data_contextless :: proc "contextless" (o: ^Once, fn: proc "context
 //       blocks for the specified duration.
 //     * The `unpark` procedure automatically makes the token available if it
 //       was not already.
-Parker :: struct {
+Parker :: struct #no_copy {
 	state: Futex,
 }
 
diff --git a/core/sync/primitives.odin b/core/sync/primitives.odin
index 8d6ce6e48..b8bcfad70 100644
--- a/core/sync/primitives.odin
+++ b/core/sync/primitives.odin
@@ -11,7 +11,7 @@ current_thread_id :: proc "contextless" () -> int {
 // The zero value for a Mutex is an unlocked mutex
 //
 // A Mutex must not be copied after first use
-Mutex :: struct {
+Mutex :: struct #no_copy {
 	impl: _Mutex,
 }
 
@@ -47,7 +47,7 @@ mutex_guard :: proc "contextless" (m: ^Mutex) -> bool {
 // The zero value for a RW_Mutex is an unlocked mutex
 //
 // A RW_Mutex must not be copied after first use
-RW_Mutex :: struct {
+RW_Mutex :: struct #no_copy {
 	impl: _RW_Mutex,
 }
 
@@ -111,7 +111,7 @@ rw_mutex_shared_guard :: proc "contextless" (m: ^RW_Mutex) -> bool {
 // The zero value for a Recursive_Mutex is an unlocked mutex
 //
 // A Recursive_Mutex must not be copied after first use
-Recursive_Mutex :: struct {
+Recursive_Mutex :: struct #no_copy {
 	impl: _Recursive_Mutex,
 }
 
@@ -144,7 +144,7 @@ recursive_mutex_guard :: proc "contextless" (m: ^Recursive_Mutex) -> bool {
 // waiting for signalling the occurence of an event
 //
 // A Cond must not be copied after first use
-Cond :: struct {
+Cond :: struct #no_copy {
 	impl: _Cond,
 }
 
@@ -172,7 +172,7 @@ cond_broadcast :: proc "contextless" (c: ^Cond) {
 // Posting to the semaphore increases the count by one, or the provided amount.
 //
 // A Sema must not be copied after first use
-Sema :: struct {
+Sema :: struct #no_copy {
 	impl: _Sema,
 }
 
diff --git a/core/sync/primitives_atomic.odin b/core/sync/primitives_atomic.odin
index 1abad5875..1b7cdfe35 100644
--- a/core/sync/primitives_atomic.odin
+++ b/core/sync/primitives_atomic.odin
@@ -13,7 +13,7 @@ Atomic_Mutex_State :: enum Futex {
 // The zero value for a Atomic_Mutex is an unlocked mutex
 //
 // An Atomic_Mutex must not be copied after first use
-Atomic_Mutex :: struct {
+Atomic_Mutex :: struct #no_copy {
 	state: Atomic_Mutex_State,
 }
 
@@ -109,7 +109,7 @@ Atomic_RW_Mutex_State_Reader_Mask :: Atomic_RW_Mutex_State(1<<(Atomic_RW_Mutex_S
 // The zero value for an Atomic_RW_Mutex is an unlocked mutex
 //
 // An Atomic_RW_Mutex must not be copied after first use
-Atomic_RW_Mutex :: struct {
+Atomic_RW_Mutex :: struct #no_copy {
 	state: Atomic_RW_Mutex_State,
 	mutex: Atomic_Mutex,
 	sema:  Atomic_Sema,
@@ -222,7 +222,7 @@ atomic_rw_mutex_shared_guard :: proc "contextless" (m: ^Atomic_RW_Mutex) -> bool
 // The zero value for a Recursive_Mutex is an unlocked mutex
 //
 // An Atomic_Recursive_Mutex must not be copied after first use
-Atomic_Recursive_Mutex :: struct {
+Atomic_Recursive_Mutex :: struct #no_copy {
 	owner:     int,
 	recursion: int,
 	mutex: Mutex,
@@ -285,7 +285,7 @@ atomic_recursive_mutex_guard :: proc "contextless" (m: ^Atomic_Recursive_Mutex)
 // waiting for signalling the occurence of an event
 //
 // An Atomic_Cond must not be copied after first use
-Atomic_Cond :: struct {
+Atomic_Cond :: struct #no_copy {
 	state: Futex,
 }
 
@@ -320,7 +320,7 @@ atomic_cond_broadcast :: proc "contextless" (c: ^Atomic_Cond) {
 // Posting to the semaphore increases the count by one, or the provided amount.
 //
 // An Atomic_Sema must not be copied after first use
-Atomic_Sema :: struct {
+Atomic_Sema :: struct #no_copy {
 	count: Futex,
 }