diff --git a/src/ifcconvert/IfcConvert.cpp b/src/ifcconvert/IfcConvert.cpp
index d69e4345e5..6d4e8a7123 100644
--- a/src/ifcconvert/IfcConvert.cpp
+++ b/src/ifcconvert/IfcConvert.cpp
@@ -603,12 +603,18 @@ int main(int argc, char** argv) {
 		// These serializers do not support opening unicode paths. Therefore
 		// a random temp file is generated using only ASCII characters instead.
 		std::random_device rng;
-		std::uniform_int_distribution<int> index_dist(L'A', L'Z');
-		output_temp_filename = L".ifcopenshell.";
-		for (int i = 0; i < 8; ++i) {
-			output_temp_filename.push_back(static_cast<wchar_t>(index_dist(rng)));
+		std::uniform_int_distribution<int> index_dist('A', 'Z');
+		{
+			std::string v = ".ifcopenshell.";
+			output_temp_filename += path_t(v.begin(), v.end());
+		}
+		for (int i = 0; i < 8; ++i) {
+			output_temp_filename.push_back(static_cast<path_t::value_type>(index_dist(rng)));
+		}
+		{
+			std::string v = ".tmp.";
+			output_temp_filename += path_t(v.begin(), v.end());
 		}
-		output_temp_filename += L".tmp";
 	}
 
 	SerializerSettings settings;