diff --git a/target/arm/translate-sme.c b/target/arm/translate-sme.c
index 8cce34e117..0fcd4ad950 100644
--- a/target/arm/translate-sme.c
+++ b/target/arm/translate-sme.c
@@ -56,7 +56,15 @@ static TCGv_ptr get_tile_rowcol(DisasContext *s, int esz, int rs,
     /* Prepare a power-of-two modulo via extraction of @len bits. */
     len = ctz32(streaming_vec_reg_size(s)) - esz;
 
-    if (vertical) {
+    if (!len) {
+        /*
+         * SVL is 128 and the element size is 128. There is exactly
+         * one 128x128 tile in the ZA storage, and so we calculate
+         * (Rs + imm) MOD 1, which is always 0. We need to special case
+         * this because TCG doesn't allow deposit ops with len 0.
+         */
+        tcg_gen_movi_i32(tmp, 0);
+    } else if (vertical) {
         /*
          * Compute the byte offset of the index within the tile:
          *     (index % (svl / size)) * size