diff --git a/lib/ftl/ftl_core.c b/lib/ftl/ftl_core.c
index 476746751..e2d05cc28 100644
--- a/lib/ftl/ftl_core.c
+++ b/lib/ftl/ftl_core.c
@@ -48,9 +48,6 @@
 #include "ftl_debug.h"
 #include "ftl_reloc.h"
 
-/* Max number of iovecs */
-#define FTL_MAX_IOV 1024
-
 struct ftl_wptr {
 	/* Owner device */
 	struct spdk_ftl_dev		*dev;
@@ -1615,7 +1612,7 @@ spdk_ftl_write(struct spdk_ftl_dev *dev, struct spdk_io_channel *ch, uint64_t lb
 {
 	struct ftl_io *io;
 
-	if (iov_cnt == 0 || iov_cnt > FTL_MAX_IOV) {
+	if (iov_cnt == 0 || iov_cnt > FTL_IO_MAX_IOVEC) {
 		return -EINVAL;
 	}
 
@@ -1667,7 +1664,7 @@ spdk_ftl_read(struct spdk_ftl_dev *dev, struct spdk_io_channel *ch, uint64_t lba
 {
 	struct ftl_io *io;
 
-	if (iov_cnt == 0 || iov_cnt > FTL_MAX_IOV) {
+	if (iov_cnt == 0 || iov_cnt > FTL_IO_MAX_IOVEC) {
 		return -EINVAL;
 	}
 
diff --git a/lib/ftl/ftl_io.c b/lib/ftl/ftl_io.c
index cff86b830..1cd32be64 100644
--- a/lib/ftl/ftl_io.c
+++ b/lib/ftl/ftl_io.c
@@ -75,11 +75,7 @@ ftl_io_dec_req(struct ftl_io *io)
 struct iovec *
 ftl_io_iovec(struct ftl_io *io)
 {
-	if (io->iov_cnt > 1) {
-		return io->iov.vector;
-	} else {
-		return &io->iov.single;
-	}
+	return &io->iov[0];
 }
 
 uint64_t
@@ -166,8 +162,8 @@ ftl_io_init_iovec(struct ftl_io *io, void *buf, size_t lbk_cnt)
 	io->lbk_cnt = lbk_cnt;
 	io->iov_cnt = 1;
 
-	io->iov.single.iov_base = buf;
-	io->iov.single.iov_len = lbk_cnt * PAGE_SIZE;
+	io->iov[0].iov_base = buf;
+	io->iov[0].iov_len = lbk_cnt * PAGE_SIZE;
 }
 
 void
@@ -292,11 +288,8 @@ ftl_io_user_init(struct spdk_io_channel *_ioch, uint64_t lba, size_t lbk_cnt, st
 	io->lbk_cnt = lbk_cnt;
 	io->iov_cnt = iov_cnt;
 
-	if (iov_cnt > 1) {
-		io->iov.vector = iov;
-	} else {
-		io->iov.single = *iov;
-	}
+	assert(iov_cnt < FTL_IO_MAX_IOVEC);
+	memcpy(io->iov, iov, iov_cnt * sizeof(*iov));
 
 	ftl_trace_lba_io_init(io->dev, io);
 
diff --git a/lib/ftl/ftl_io.h b/lib/ftl/ftl_io.h
index c9c2451a6..25ec1ce38 100644
--- a/lib/ftl/ftl_io.h
+++ b/lib/ftl/ftl_io.h
@@ -161,13 +161,8 @@ struct ftl_io {
 	/* Number of lbks */
 	size_t					lbk_cnt;
 
-	union {
-		/* IO vector table */
-		struct iovec			*vector;
-
-		/* Single iovec */
-		struct iovec			single;
-	} iov;
+#define FTL_IO_MAX_IOVEC 64
+	struct iovec				iov[FTL_IO_MAX_IOVEC];
 
 	/* Metadata */
 	void					*md;
diff --git a/lib/ftl/ftl_reloc.c b/lib/ftl/ftl_reloc.c
index 2f159c9be..c696d714c 100644
--- a/lib/ftl/ftl_reloc.c
+++ b/lib/ftl/ftl_reloc.c
@@ -213,7 +213,7 @@ ftl_reloc_prep(struct ftl_band_reloc *breloc)
 static void
 ftl_reloc_free_io(struct ftl_band_reloc *breloc, struct ftl_io *io)
 {
-	spdk_dma_free(io->iov.single.iov_base);
+	spdk_dma_free(io->iov[0].iov_base);
 	free(io->lba.vector);
 	spdk_ring_enqueue(breloc->free_queue, (void **)&io, 1);
 }
diff --git a/test/unit/lib/ftl/ftl_reloc.c/ftl_reloc_ut.c b/test/unit/lib/ftl/ftl_reloc.c/ftl_reloc_ut.c
index 9e082463a..7e69d2748 100644
--- a/test/unit/lib/ftl/ftl_reloc.c/ftl_reloc_ut.c
+++ b/test/unit/lib/ftl/ftl_reloc.c/ftl_reloc_ut.c
@@ -154,7 +154,7 @@ ftl_io_init_internal(const struct ftl_io_init_opts *opts)
 	io->cb.fn = opts->fn;
 	io->cb.ctx = io;
 	io->lbk_cnt = opts->lbk_cnt;
-	io->iov.single.iov_base = opts->data;
+	io->iov[0].iov_base = opts->data;
 	return io;
 }