diff --git a/libevmcore/ExpressionClasses.cpp b/libevmcore/ExpressionClasses.cpp
index f9ed7d6fc..b43b54113 100644
--- a/libevmcore/ExpressionClasses.cpp
+++ b/libevmcore/ExpressionClasses.cpp
@@ -167,7 +167,6 @@ Rules::Rules()
 		{{Instruction::OR, {X, X}}, [=]{ return X; }},
 		{{Instruction::SUB, {X, X}}, [=]{ return u256(0); }},
 		{{Instruction::EQ, {X, X}}, [=]{ return u256(1); }},
-		{{Instruction::EQ, {X, X}}, [=]{ return u256(1); }},
 		{{Instruction::LT, {X, X}}, [=]{ return u256(0); }},
 		{{Instruction::SLT, {X, X}}, [=]{ return u256(0); }},
 		{{Instruction::GT, {X, X}}, [=]{ return u256(0); }},