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-rw-r--r--miasm2/arch/x86/sem.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/miasm2/arch/x86/sem.py b/miasm2/arch/x86/sem.py
index c39617f6..a51848a9 100644
--- a/miasm2/arch/x86/sem.py
+++ b/miasm2/arch/x86/sem.py
@@ -2121,7 +2121,8 @@ def fisubr(ir, instr, a, b=None):
 def fpatan(ir, instr):
     e = []
     a = float_st1
-    e.append(m2_expr.ExprAff(a, m2_expr.ExprOp('fpatan', float_st0, float_st1)))
+    e.append(m2_expr.ExprAff(float_prev(a),
+                             m2_expr.ExprOp('fpatan', float_st0, float_st1)))
     e += set_float_cs_eip(instr)
     e += float_pop(a)
     return e, []