diff --git a/module/zfs/zfs_vnops.c b/module/zfs/zfs_vnops.c
index b9e93791d5..918938d628 100644
--- a/module/zfs/zfs_vnops.c
+++ b/module/zfs/zfs_vnops.c
@@ -261,7 +261,9 @@ zfs_read(struct znode *zp, zfs_uio_t *uio, int ioflag, cred_t *cr)
 	}
 
 	ASSERT(zfs_uio_offset(uio) < zp->z_size);
+#if defined(__linux__)
 	ssize_t start_offset = zfs_uio_offset(uio);
+#endif
 	ssize_t n = MIN(zfs_uio_resid(uio), zp->z_size - zfs_uio_offset(uio));
 	ssize_t start_resid = n;
 
@@ -284,13 +286,18 @@ zfs_read(struct znode *zp, zfs_uio_t *uio, int ioflag, cred_t *cr)
 			/* convert checksum errors into IO errors */
 			if (error == ECKSUM)
 				error = SET_ERROR(EIO);
+
+#if defined(__linux__)
 			/*
 			 * if we actually read some bytes, bubbling EFAULT
-			 * up to become EAGAIN isn't what we want here.
+			 * up to become EAGAIN isn't what we want here...
+			 *
+			 * ...on Linux, at least. On FBSD, doing this breaks.
 			 */
 			if (error == EFAULT &&
 			    (zfs_uio_offset(uio) - start_offset) != 0)
 				error = 0;
+#endif
 			break;
 		}