diff --git a/hiro/gtk/application.cpp b/hiro/gtk/application.cpp
index b1bc3770b7..383b3b840a 100644
--- a/hiro/gtk/application.cpp
+++ b/hiro/gtk/application.cpp
@@ -145,6 +145,12 @@ auto pApplication::initialize() -> void {
   char** argvp = argv;
 
   gtk_init(&argc, &argvp);
+
+  // gtk_init causes GTK to set the locale from the environment.
+  // Set the locale for LC_NUMERIC back to "C". It is expected to be "C" for
+  // the purpose of various string formatting and parsing operations.
+  setlocale(LC_NUMERIC, "C");
+
   GtkSettings* gtkSettings = gtk_settings_get_default();
 
   //allow buttons to show icons
diff --git a/hiro/qt/application.cpp b/hiro/qt/application.cpp
index 3c9bd9dfbb..e7169a2325 100644
--- a/hiro/qt/application.cpp
+++ b/hiro/qt/application.cpp
@@ -124,6 +124,11 @@ auto pApplication::initialize() -> void {
   static char** argvp = argv;
   qtApplication = new QApplication(argc, argvp);
 
+  // Creating the QApplication causes Qt to set the locale from the environment.
+  // Set the locale for LC_NUMERIC back to "C". It is expected to be "C" for
+  // the purpose of various string formatting and parsing operations.
+  setlocale(LC_NUMERIC, "C");
+
   pKeyboard::initialize();
 }
 
diff --git a/nall/main.cpp b/nall/main.cpp
index 2846312268..c11cf2ad08 100644
--- a/nall/main.cpp
+++ b/nall/main.cpp
@@ -19,8 +19,6 @@ auto main(int argc, char** argv) -> int {
   _setmode(_fileno(stderr), O_BINARY);
   #endif
 
-  setlocale(LC_NUMERIC, "C"); // Enforce 'standard' locale for numeric formatting
-
   main(Arguments{argc, argv});
 
   #if !defined(PLATFORM_WINDOWS)