diff --git a/liblangutil/Token.h b/liblangutil/Token.h
index c4907aeac..ef0c7f6af 100644
--- a/liblangutil/Token.h
+++ b/liblangutil/Token.h
@@ -300,7 +300,7 @@ namespace TokenTraits
 
 	constexpr bool isBitOp(Token op) { return (Token::BitOr <= op && op <= Token::BitAnd) || op == Token::BitNot; }
 	constexpr bool isBooleanOp(Token op) { return (Token::Or <= op && op <= Token::And) || op == Token::Not; }
-	constexpr bool isUnaryOp(Token op) { return (Token::Not <= op && op <= Token::Delete) || op == Token::Add || op == Token::Sub; }
+	constexpr bool isUnaryOp(Token op) { return (Token::Not <= op && op <= Token::Delete) || op == Token::Sub; }
 	constexpr bool isCountOp(Token op) { return op == Token::Inc || op == Token::Dec; }
 	constexpr bool isShiftOp(Token op) { return (Token::SHL <= op) && (op <= Token::SHR); }
 	constexpr bool isVariableVisibilitySpecifier(Token op) { return op == Token::Public || op == Token::Private || op == Token::Internal; }
diff --git a/libsolidity/analysis/TypeChecker.cpp b/libsolidity/analysis/TypeChecker.cpp
index efbbc5741..f0d4ecda3 100644
--- a/libsolidity/analysis/TypeChecker.cpp
+++ b/libsolidity/analysis/TypeChecker.cpp
@@ -4035,9 +4035,7 @@ void TypeChecker::endVisit(UsingForDirective const& _usingFor)
 
 			bool identicalFirstTwoParameters = (parameterCount < 2 || *parameterTypes.at(0) == *parameterTypes.at(1));
 			bool isUnaryOnlyOperator = (!TokenTraits::isBinaryOp(operator_.value()) && TokenTraits::isUnaryOp(operator_.value()));
-			bool isBinaryOnlyOperator =
-				(TokenTraits::isBinaryOp(operator_.value()) && !TokenTraits::isUnaryOp(operator_.value())) ||
-				operator_.value() == Token::Add;
+			bool isBinaryOnlyOperator = (TokenTraits::isBinaryOp(operator_.value()) && !TokenTraits::isUnaryOp(operator_.value()));
 			bool firstParameterMatchesUsingFor = parameterCount == 0 || *usingForType == *parameterTypes.front();
 
 			optional<string> wrongParametersMessage;