diff --git a/src/libstd/sys/sgx/abi/entry.S b/src/libstd/sys/sgx/abi/entry.S
index c35e49b1dc6ea..cd26c7ca200b0 100644
--- a/src/libstd/sys/sgx/abi/entry.S
+++ b/src/libstd/sys/sgx/abi/entry.S
@@ -119,8 +119,14 @@ sgx_entry:
     mov %rbx,%gs:tcsls_tcs_addr
     stmxcsr %gs:tcsls_user_mxcsr
     fnstcw %gs:tcsls_user_fcw
+
 /*  reset user state */
-    cld /* x86-64 ABI requires DF to be unset at function entry/exit */
+/*    - DF flag: x86-64 ABI requires DF to be unset at function entry/exit */
+/*    - AC flag: AEX on misaligned memory accesses leaks side channel info */
+    pushfq
+    andq $~0x40400, (%rsp)
+    popfq
+
 /*  check for debug buffer pointer */
     testb  $0xff,DEBUG(%rip)
     jz .Lskip_debug_init