diff --git a/tests/unit/test_fmha_ts_full.cu b/tests/unit/test_fmha_ts_full.cu
index bd2530bc..77c9888a 100644
--- a/tests/unit/test_fmha_ts_full.cu
+++ b/tests/unit/test_fmha_ts_full.cu
@@ -134,7 +134,7 @@ test_fmha_ts_full(const bf16_t* __restrict__ q, const bf16_t* __restrict__ k,
     {
         uint32_t idesc_pv = make_idesc(BLOCK_MN, HD);
 
-        for (int kt = 0; kt < NKT_PV; kt++) {
+        for (int kt = 0; kt < 1; kt++) {  // DEBUG: single PV K-tile
             uint32_t tmem_a = tb + kt * MMA_K_BF16;  // A from P's kt-th 16 columns
             bf16_t* sv = sV + kt * 256;
             uint64_t dv = make_umma_desc_kmajor_none(__cvta_generic_to_shared(sv), 16);