diff --git a/src/formula/function.cpp b/src/formula/function.cpp
index e9a148d4afa1..02c4c6a60172 100644
--- a/src/formula/function.cpp
+++ b/src/formula/function.cpp
@@ -1368,7 +1368,7 @@ formula_function_expression::formula_function_expression(const std::string& name
 	, star_arg_(-1)
 {
 	for(std::size_t n = 0; n != arg_names_.size(); ++n) {
-		if(arg_names_.empty() == false && arg_names_[n].back() == '*') {
+		if(arg_names_[n].empty() == false && arg_names_[n].back() == '*') {
 			arg_names_[n].resize(arg_names_[n].size() - 1);
 			star_arg_ = n;
 			break;