diff --git a/dsv4/kernels/attention/fmha_sm100.cuh b/dsv4/kernels/attention/fmha_sm100.cuh
index 06683854..7d8cc947 100644
--- a/dsv4/kernels/attention/fmha_sm100.cuh
+++ b/dsv4/kernels/attention/fmha_sm100.cuh
@@ -31,6 +31,7 @@
 
 #include <cuda_runtime.h>
 #include <cuda_bf16.h>
+#include <cstdint>
 
 // CUTLASS C++ includes (CUDA device code only)
 #if defined(__CUDA_ARCH__)