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-rw-r--r--Source/Parser/WarpXParser.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/Source/Parser/WarpXParser.cpp b/Source/Parser/WarpXParser.cpp
index 093d7b2d6..38350ab3c 100644
--- a/Source/Parser/WarpXParser.cpp
+++ b/Source/Parser/WarpXParser.cpp
@@ -100,7 +100,7 @@ WarpXParser::registerVariables (std::vector<std::string> const& names)
const int tid = omp_get_thread_num();
struct wp_parser* p = m_parser[tid];
auto& v = m_variables[tid];
- for (int j = 0; j < names.size(); ++j) {
+ for (int j = 0; j < static_cast<int>(names.size()); ++j) {
wp_parser_regvar(p, names[j].c_str(), &(v[j]));
m_varnames[tid].push_back(names[j]);
}