diff --git a/shmem/unix/shm.c b/shmem/unix/shm.c
index ab55abce39..d6f12d8388 100644
--- a/shmem/unix/shm.c
+++ b/shmem/unix/shm.c
@@ -706,7 +706,9 @@ APR_PERMS_SET_IMPLEMENT(shm)
         return errno;
     }
     return APR_SUCCESS;
-#elif APR_USE_SHMEM_MMAP_SHM
+#elif APR_USE_SHMEM_MMAP_SHM && !defined(DARWIN)
+    /* ### This hangs or fails on MacOS, so skipping this for the
+     * ENOTIMPL case there - unclear why or if that's fixable. */
     apr_shm_t *shm = (apr_shm_t *)theshm;
     const char *shm_name;
     int fd;