diff --git a/gtk/src/gtk_display_driver_opengl.cpp b/gtk/src/gtk_display_driver_opengl.cpp
index d069735e..8c1e3f16 100644
--- a/gtk/src/gtk_display_driver_opengl.cpp
+++ b/gtk/src/gtk_display_driver_opengl.cpp
@@ -362,6 +362,8 @@ int S9xOpenGLDisplayDriver::load_shaders (const char *shader_file)
 {
     int length = strlen (shader_file);
 
+    setlocale (LC_ALL, "C");
+
     if ((length > 6 && !strcasecmp(shader_file + length - 6, ".glslp")) ||
         (length > 5 && !strcasecmp(shader_file + length - 5, ".glsl")))
     {
@@ -374,12 +376,14 @@ int S9xOpenGLDisplayDriver::load_shaders (const char *shader_file)
             if (glsl_shader->param.size () > 0)
                 window->enable_widget ("shader_parameters_item", TRUE);
 
+            setlocale (LC_ALL, "");
             return 1;
         }
 
         delete glsl_shader;
     }
 
+    setlocale (LC_ALL, "");
     return 0;
 }
 
diff --git a/gtk/src/gtk_s9x.cpp b/gtk/src/gtk_s9x.cpp
index a287566e..b347803b 100644
--- a/gtk/src/gtk_s9x.cpp
+++ b/gtk/src/gtk_s9x.cpp
@@ -42,6 +42,7 @@ int main (int argc, char *argv[])
     g_set_prgname ("snes9x");
     g_set_application_name ("Snes9x");
 
+    setlocale (LC_ALL, "");
     bindtextdomain (GETTEXT_PACKAGE, SNES9XLOCALEDIR);
     bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
     textdomain (GETTEXT_PACKAGE);