diff --git a/ports/unix/alloc.c b/ports/unix/alloc.c
index c508139a8..9ef19cb43 100644
--- a/ports/unix/alloc.c
+++ b/ports/unix/alloc.c
@@ -31,7 +31,6 @@
 #include <sys/mman.h>
 
 #include "py/mpstate.h"
-#include "py/gc.h"
 
 #if MICROPY_EMIT_NATIVE || (MICROPY_PY_FFI && MICROPY_FORCE_PLAT_ALLOC_EXEC)
 
@@ -79,12 +78,6 @@ void mp_unix_free_exec(void *ptr, size_t size) {
     }
 }
 
-void mp_unix_mark_exec(void) {
-    for (mmap_region_t *rg = MP_STATE_VM(mmap_region_head); rg != NULL; rg = rg->next) {
-        gc_collect_root(rg->ptr, rg->len / sizeof(mp_uint_t));
-    }
-}
-
 MP_REGISTER_ROOT_POINTER(void *mmap_region_head);
 
 #endif // MICROPY_EMIT_NATIVE || (MICROPY_PY_FFI && MICROPY_FORCE_PLAT_ALLOC_EXEC)
diff --git a/ports/unix/gccollect.c b/ports/unix/gccollect.c
index 94c9c61ea..8f0f5a676 100644
--- a/ports/unix/gccollect.c
+++ b/ports/unix/gccollect.c
@@ -39,9 +39,6 @@ void gc_collect(void) {
     #if MICROPY_PY_THREAD
     mp_thread_gc_others();
     #endif
-    #if MICROPY_EMIT_NATIVE
-    mp_unix_mark_exec();
-    #endif
     gc_collect_end();
 }
 
diff --git a/ports/unix/mpconfigport.h b/ports/unix/mpconfigport.h
index 412754711..c12c0c9d9 100644
--- a/ports/unix/mpconfigport.h
+++ b/ports/unix/mpconfigport.h
@@ -168,7 +168,6 @@ extern const struct _mp_print_t mp_stderr_print;
 // For the native emitter configure how to mark a region as executable.
 void mp_unix_alloc_exec(size_t min_size, void **ptr, size_t *size);
 void mp_unix_free_exec(void *ptr, size_t size);
-void mp_unix_mark_exec(void);
 #define MP_PLAT_ALLOC_EXEC(min_size, ptr, size) mp_unix_alloc_exec(min_size, ptr, size)
 #define MP_PLAT_FREE_EXEC(ptr, size) mp_unix_free_exec(ptr, size)
 #ifndef MICROPY_FORCE_PLAT_ALLOC_EXEC