diff --git a/apps/openmw/mwmp/Cell.cpp b/apps/openmw/mwmp/Cell.cpp
index 4b3f4605f..a3a061991 100644
--- a/apps/openmw/mwmp/Cell.cpp
+++ b/apps/openmw/mwmp/Cell.cpp
@@ -1,6 +1,7 @@
 #include "../mwworld/worldimp.hpp"
 #include <components/esm/cellid.hpp>
 #include <components/openmw-mp/Log.hpp>
+#include <components/openmw-mp/Utils.hpp>
 
 #include "Cell.hpp"
 #include "Main.hpp"
@@ -75,8 +76,8 @@ std::string Cell::generateMapIndex(MWWorld::Ptr ptr)
 {
     std::string mapIndex = "";
     mapIndex += ptr.getCellRef().getRefId();
-    mapIndex += "-" + std::to_string(ptr.getCellRef().getRefNum().mIndex);
-    mapIndex += "-" + std::to_string(ptr.getCellRef().getMpNum());
+    mapIndex += "-" + Utils::toString(ptr.getCellRef().getRefNum().mIndex);
+    mapIndex += "-" + Utils::toString(ptr.getCellRef().getMpNum());
     return mapIndex;
 }
 
diff --git a/components/openmw-mp/Utils.cpp b/components/openmw-mp/Utils.cpp
index c9a65f462..60ea82931 100644
--- a/components/openmw-mp/Utils.cpp
+++ b/components/openmw-mp/Utils.cpp
@@ -9,6 +9,7 @@
 #include <ctime>
 #include <cmath>
 #include <memory>
+#include <sstream>
 #include <boost/crc.hpp>
 #include <boost/filesystem/fstream.hpp>
 
@@ -82,6 +83,13 @@ bool Utils::DoubleCompare(double a, double b, double epsilon)
     return fabs(a - b) < epsilon;
 }
 
+std::string Utils::toString(int num)
+{
+    std::ostringstream stream;
+    stream << num;
+    return stream.str();
+}
+
 string Utils::str_replace(const string& source, const char* find, const char* replace)
 {
     unsigned int find_len = strlen(find);
diff --git a/components/openmw-mp/Utils.hpp b/components/openmw-mp/Utils.hpp
index 2217f0378..88ad2b1b7 100644
--- a/components/openmw-mp/Utils.hpp
+++ b/components/openmw-mp/Utils.hpp
@@ -23,6 +23,8 @@ namespace Utils
 
     std::string str_replace(const std::string &source, const char *find, const char *replace);
 
+    std::string toString(int num);
+
     std::string &RemoveExtension(std::string &file);
 
     long int FileLength(const char *file);