diff --git a/lib/libspl/include/umem.h b/lib/libspl/include/umem.h
index 82976f756b..77c2167212 100644
--- a/lib/libspl/include/umem.h
+++ b/lib/libspl/include/umem.h
@@ -137,6 +137,21 @@ umem_free(const void *ptr, size_t size __maybe_unused)
 	free((void *)ptr);
 }
 
+/*
+ * umem_free_aligned was added for supporting portability
+ * with non-POSIX platforms that require a different free
+ * to be used with aligned allocations.
+ */
+static inline void
+umem_free_aligned(void *ptr, size_t size __maybe_unused)
+{
+#ifndef _WIN32
+	free((void *)ptr);
+#else
+	_aligned_free(ptr);
+#endif
+}
+
 static inline void
 umem_nofail_callback(umem_nofail_callback_t *cb __maybe_unused)
 {}
@@ -196,7 +211,10 @@ umem_cache_free(umem_cache_t *cp, void *ptr)
 	if (cp->cache_destructor)
 		cp->cache_destructor(ptr, cp->cache_private);
 
-	umem_free(ptr, cp->cache_bufsize);
+	if (cp->cache_align != 0)
+		umem_free_aligned(ptr, cp->cache_bufsize);
+	else
+		umem_free(ptr, cp->cache_bufsize);
 }
 
 static inline void
diff --git a/lib/libzutil/zutil_import.c b/lib/libzutil/zutil_import.c
index fee176184e..5d7b4a946c 100644
--- a/lib/libzutil/zutil_import.c
+++ b/lib/libzutil/zutil_import.c
@@ -934,7 +934,6 @@ zpool_read_label_slow(int fd, nvlist_t **config, int *num_labels)
 	vdev_phys_t *label;
 	nvlist_t *expected_config = NULL;
 	uint64_t expected_guid = 0, size;
-	int error;
 
 	*config = NULL;
 
@@ -942,8 +941,9 @@ zpool_read_label_slow(int fd, nvlist_t **config, int *num_labels)
 		return (0);
 	size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t);
 
-	error = posix_memalign((void **)&label, PAGESIZE, sizeof (*label));
-	if (error)
+	label = (vdev_phys_t *)umem_alloc_aligned(sizeof (*label), PAGESIZE,
+	    UMEM_DEFAULT);
+	if (label == NULL)
 		return (-1);
 
 	for (l = 0; l < VDEV_LABELS; l++) {
@@ -992,7 +992,7 @@ zpool_read_label_slow(int fd, nvlist_t **config, int *num_labels)
 	if (num_labels != NULL)
 		*num_labels = count;
 
-	free(label);
+	umem_free_aligned(label, sizeof (*label));
 	*config = expected_config;
 
 	return (0);
@@ -1023,9 +1023,9 @@ zpool_read_label(int fd, nvlist_t **config, int *num_labels)
 		return (0);
 	size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t);
 
-	error = posix_memalign((void **)&labels, PAGESIZE,
-	    VDEV_LABELS * sizeof (*labels));
-	if (error)
+	labels = (vdev_phys_t *)umem_alloc_aligned(
+	    VDEV_LABELS * sizeof (*labels), PAGESIZE, UMEM_DEFAULT);
+	if (labels == NULL)
 		return (-1);
 
 	memset(aiocbs, 0, sizeof (aiocbs));
@@ -1078,7 +1078,7 @@ zpool_read_label(int fd, nvlist_t **config, int *num_labels)
 			error = zpool_read_label_slow(fd, config, num_labels);
 			saved_errno = errno;
 		}
-		free(labels);
+		umem_free_aligned(labels, VDEV_LABELS * sizeof (*labels));
 		errno = saved_errno;
 		return (error);
 	}
@@ -1127,7 +1127,7 @@ zpool_read_label(int fd, nvlist_t **config, int *num_labels)
 	if (num_labels != NULL)
 		*num_labels = count;
 
-	free(labels);
+	umem_free_aligned(labels, VDEV_LABELS * sizeof (*labels));
 	*config = expected_config;
 
 	return (0);
diff --git a/module/os/linux/zfs/abd_os.c b/module/os/linux/zfs/abd_os.c
index e9b28becf6..16530d8269 100644
--- a/module/os/linux/zfs/abd_os.c
+++ b/module/os/linux/zfs/abd_os.c
@@ -598,7 +598,7 @@ abd_free_chunks(abd_t *abd)
 
 	abd_for_each_sg(abd, sg, n, i) {
 		struct page *p = nth_page(sg_page(sg), 0);
-		umem_free(p, PAGESIZE);
+		umem_free_aligned(p, PAGESIZE);
 	}
 	abd_free_sg_table(abd);
 }
@@ -704,7 +704,7 @@ abd_free_zero_scatter(void)
 	__free_page(abd_zero_page);
 #endif /* HAVE_ZERO_PAGE_GPL_ONLY */
 #else
-	umem_free(abd_zero_page, PAGESIZE);
+	umem_free_aligned(abd_zero_page, PAGESIZE);
 #endif /* _KERNEL */
 }