diff --git a/dap-sdk/core/include/dap_math_ops.h b/dap-sdk/core/include/dap_math_ops.h
index d67bad88e18d48a11ebf3fb6d4abde20f41aa39d..7309fc75ab34908502b9a0fba15aa60e4cefd6ba 100755
--- a/dap-sdk/core/include/dap_math_ops.h
+++ b/dap-sdk/core/include/dap_math_ops.h
@@ -30,11 +30,3 @@ typedef union int128{int64_t i64[2];} int128_t;
 
 #endif
 
-typedef union dap_uint128{
-    uint8_t data_raw[16];
-#if defined(DAP_GLOBAL_IS_INT128)
-    _dap_int128_t data_int128;
-#endif
-} dap_uint128_t;
-
-