Index: src/runtime/threading.m
==================================================================
--- src/runtime/threading.m
+++ src/runtime/threading.m
@@ -23,11 +23,10 @@
 #import "ObjFW_RT.h"
 #import "private.h"
 #import "threading.h"
 
 static of_rmutex_t global_mutex;
-static of_once_t once_control = OF_ONCE_INIT;
 
 static void
 init(void)
 {
 	if (!of_rmutex_new(&global_mutex))
@@ -35,10 +34,11 @@
 }
 
 void
 objc_global_mutex_lock(void)
 {
+	static of_once_t once_control = OF_ONCE_INIT;
 	of_once(&once_control, init);
 
 	if (!of_rmutex_lock(&global_mutex))
 		OBJC_ERROR("Failed to lock global mutex!");
 }

Index: src/socket.m
==================================================================
--- src/socket.m
+++ src/socket.m
@@ -37,14 +37,13 @@
 # include <3ds/types.h>
 # include <3ds/services/soc.h>
 #endif
 
 #ifdef OF_HAVE_THREADS
-static of_once_t onceControl = OF_ONCE_INIT;
 static of_mutex_t mutex;
 #endif
-static bool initialized = false;
+static bool initSuccessful = false;
 
 static void
 init(void)
 {
 #if defined(OF_WINDOWS)
@@ -75,24 +74,28 @@
 	if (!of_spinlock_new(&spinlock))
 		return;
 # endif
 #endif
 
-	initialized = true;
+	initSuccessful = true;
 }
 
 bool
 of_socket_init()
 {
 #ifdef OF_HAVE_THREADS
+	static of_once_t onceControl = OF_ONCE_INIT;
 	of_once(&onceControl, init);
 #else
-	if (!initialized)
+	static bool initialized = false;
+	if (!initialized) {
 		init();
+		initialized = true;
+	}
 #endif
 
-	return initialized;
+	return initSuccessful;
 }
 
 int
 of_socket_errno()
 {