diff --git a/src/admesh/shared.cpp b/src/admesh/shared.cpp
index 902bbfc9b..a8fbc2a87 100644
--- a/src/admesh/shared.cpp
+++ b/src/admesh/shared.cpp
@@ -30,6 +30,8 @@
 
 #include "stl.h"
 
+#include "libslic3r/LocalesUtils.hpp"
+
 void stl_generate_shared_vertices(stl_file *stl, indexed_triangle_set &its)
 {
 	// 3 indices to vertex per face
@@ -127,6 +129,7 @@ void stl_generate_shared_vertices(stl_file *stl, indexed_triangle_set &its)
 
 bool its_write_off(const indexed_triangle_set &its, const char *file)
 {
+    Slic3r::CNumericLocalesSetter locales_setter;
 	/* Open the file */
 	FILE *fp = boost::nowide::fopen(file, "w");
 	if (fp == nullptr) {
@@ -146,6 +149,7 @@ bool its_write_off(const indexed_triangle_set &its, const char *file)
 
 bool its_write_vrml(const indexed_triangle_set &its, const char *file)
 {
+    Slic3r::CNumericLocalesSetter locales_setter;
 	/* Open the file */
   	FILE *fp = boost::nowide::fopen(file, "w");
 	if (fp == nullptr) {
@@ -188,7 +192,7 @@ bool its_write_vrml(const indexed_triangle_set &its, const char *file)
 
 bool its_write_obj(const indexed_triangle_set &its, const char *file)
 {
-
+    Slic3r::CNumericLocalesSetter locales_setter;
   	FILE *fp = boost::nowide::fopen(file, "w");
   	if (fp == nullptr) {
 		BOOST_LOG_TRIVIAL(error) << "stl_write_obj: Couldn't open " << file << " for writing";
diff --git a/src/admesh/stlinit.cpp b/src/admesh/stlinit.cpp
index 6aa2c4417..29131b1c7 100644
--- a/src/admesh/stlinit.cpp
+++ b/src/admesh/stlinit.cpp
@@ -32,6 +32,8 @@
 
 #include "stl.h"
 
+#include "libslic3r/LocalesUtils.hpp"
+
 #ifndef SEEK_SET
 #error "SEEK_SET not defined"
 #endif
@@ -232,6 +234,7 @@ static bool stl_read(stl_file *stl, FILE *fp, int first_facet, bool first)
 
 bool stl_open(stl_file *stl, const char *file)
 {
+    Slic3r::CNumericLocalesSetter locales_setter;
 	stl->clear();
 	FILE *fp = stl_open_count_facets(stl, file);
 	if (fp == nullptr)
diff --git a/src/slic3r/GUI/GCodeViewer.cpp b/src/slic3r/GUI/GCodeViewer.cpp
index f71921bec..285f07051 100644
--- a/src/slic3r/GUI/GCodeViewer.cpp
+++ b/src/slic3r/GUI/GCodeViewer.cpp
@@ -992,6 +992,9 @@ void GCodeViewer::export_toolpaths_to_obj(const char* filename) const
     // save materials file
     boost::filesystem::path mat_filename(filename);
     mat_filename.replace_extension("mtl");
+
+    CNumericLocalesSetter locales_setter;
+
     FILE* fp = boost::nowide::fopen(mat_filename.string().c_str(), "w");
     if (fp == nullptr) {
         BOOST_LOG_TRIVIAL(error) << "GCodeViewer::export_toolpaths_to_obj: Couldn't open " << mat_filename.string().c_str() << " for writing";