diff --git a/CMakeOptions.txt b/CMakeOptions.txt
index d60ca2b7..ebdba0c9 100644
--- a/CMakeOptions.txt
+++ b/CMakeOptions.txt
@@ -86,4 +86,5 @@ cmake_dependent_option(SUPPORT_FILEFORMAT_MP3  "Support loading MP3 for sound" O
 cmake_dependent_option(SUPPORT_FILEFORMAT_FLAC "Support loading FLAC for sound" ${OFF} CUSTOMIZE_BUILD OFF)
 
 # utils.c
+cmake_dependent_option(SUPPORT_STANDARD_FILEIO "Support standard file io library (stdio.h)" ON CUSTOMIZE_BUILD ON)
 cmake_dependent_option(SUPPORT_TRACELOG "Show TraceLog() output messages. NOTE: By default LOG_DEBUG traces not shown" ON CUSTOMIZE_BUILD ON)
diff --git a/cmake/CompileDefinitions.cmake b/cmake/CompileDefinitions.cmake
index b07503c1..36062b30 100644
--- a/cmake/CompileDefinitions.cmake
+++ b/cmake/CompileDefinitions.cmake
@@ -54,6 +54,7 @@ if (${CUSTOMIZE_BUILD})
     define_if("raylib" SUPPORT_FILEFORMAT_MOD)
     define_if("raylib" SUPPORT_FILEFORMAT_FLAC)
     define_if("raylib" SUPPORT_FILEFORMAT_MP3)
+    define_if("raylib" SUPPORT_STANDARD_FILEIO)
     define_if("raylib" SUPPORT_TRACELOG)
     define_if("raylib" SUPPORT_COMPRESSION_API)
     
diff --git a/src/core.c b/src/core.c
index 75b38766..c4b52b87 100644
--- a/src/core.c
+++ b/src/core.c
@@ -1044,31 +1044,31 @@ void ToggleFullscreen(void)
         if (!monitor)
         {
             TRACELOG(LOG_WARNING, "GLFW: Failed to get monitor");
-            glfwSetWindowSizeCallback(CORE.Window.handle, NULL);
-            glfwSetWindowMonitor(CORE.Window.handle, glfwGetPrimaryMonitor(), 0, 0, CORE.Window.screen.width, CORE.Window.screen.height, GLFW_DONT_CARE);
-            glfwSetWindowSizeCallback(CORE.Window.handle, WindowSizeCallback);
+    
+            CORE.Window.fullscreen = false;          // Toggle fullscreen flag
+            CORE.Window.flags &= ~FLAG_FULLSCREEN_MODE;
+            
+            glfwSetWindowMonitor(CORE.Window.handle, NULL, 0, 0, CORE.Window.screen.width, CORE.Window.screen.height, GLFW_DONT_CARE);
             return;
         }
     
-        const GLFWvidmode *mode = glfwGetVideoMode(monitor);
-        glfwSetWindowSizeCallback(CORE.Window.handle, NULL);
+        CORE.Window.fullscreen = true;          // Toggle fullscreen flag
+        CORE.Window.flags |= FLAG_FULLSCREEN_MODE;
+        
         glfwSetWindowMonitor(CORE.Window.handle, monitor, 0, 0, CORE.Window.screen.width, CORE.Window.screen.height, GLFW_DONT_CARE);
-        glfwSetWindowSizeCallback(CORE.Window.handle, WindowSizeCallback);
     }
     else
     {
-        glfwSetWindowSizeCallback(CORE.Window.handle, NULL);
+        CORE.Window.fullscreen = false;          // Toggle fullscreen flag
+        CORE.Window.flags &= ~FLAG_FULLSCREEN_MODE;
+        
         glfwSetWindowMonitor(CORE.Window.handle, NULL, CORE.Window.position.x, CORE.Window.position.y, CORE.Window.screen.width, CORE.Window.screen.height, GLFW_DONT_CARE);
-        glfwSetWindowSizeCallback(CORE.Window.handle, WindowSizeCallback);
     }
 
 	// Try to enable GPU V-Sync, so frames are limited to screen refresh rate (60Hz -> 60 FPS)
     // NOTE: V-Sync can be enabled by graphic driver configuration
     if (CORE.Window.flags & FLAG_VSYNC_HINT) glfwSwapInterval(1);
 
-    CORE.Window.fullscreen = !CORE.Window.fullscreen;          // Toggle fullscreen flag
-    CORE.Window.flags ^= FLAG_FULLSCREEN_MODE;
-
 #endif
 #if defined(PLATFORM_WEB)
     /*
@@ -4619,16 +4619,18 @@ static void ErrorCallback(int error, const char *description)
 static void WindowSizeCallback(GLFWwindow *window, int width, int height)
 {
     SetupViewport(width, height);    // Reset viewport and projection matrix for new size
-
+    CORE.Window.currentFbo.width = width;
+    CORE.Window.currentFbo.height = height;
+    CORE.Window.resizedLastFrame = true;
+    
+    if(IsWindowFullscreen())
+        return;
+    
     // Set current screen size
     CORE.Window.screen.width = width;
     CORE.Window.screen.height = height;
-    CORE.Window.currentFbo.width = width;
-    CORE.Window.currentFbo.height = height;
-
     // NOTE: Postprocessing texture is not scaled to new size
 
-    CORE.Window.resizedLastFrame = true;
 }
 
 // GLFW3 WindowIconify Callback, runs when window is minimized/restored