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-rw-r--r--miasm2/arch/x86/sem.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/miasm2/arch/x86/sem.py b/miasm2/arch/x86/sem.py
index 22e8c276..fefd484d 100644
--- a/miasm2/arch/x86/sem.py
+++ b/miasm2/arch/x86/sem.py
@@ -2003,6 +2003,9 @@ def fnstenv(ir, instr, a):
                                ])
 
     s = instr.mode
+    # The behaviour in 64bit is identical to 64 bit
+    # This will truncate addresses
+    s = min(32, s)
     ad = ExprMem(a.arg, size=16)
     e.append(ExprAff(ad, float_control))
     ad = ExprMem(a.arg + ExprInt_from(a.arg, s / 8 * 1), size=16)