diff --git a/README.md b/README.md
index 14a2aa10..e133179f 100644
--- a/README.md
+++ b/README.md
@@ -104,6 +104,7 @@ mkxp-z provides limited support for some WinAPI functions that would normally br
 * `SetWindowTextA`: Sets the window title.
 * `GetWindowRect`: Returns the screen coordinates of the game window's corners.
 * `RegisterHotKey`: No-op. pls no disabling SDL's precious fullscreen.
+* `SetWindowLong`: Only supports switching between fullscreen/windowed modes. Always returns `571`.
 * `GetKeyboardState`: On Windows, adds states for Shift based on SDL's keystates. Emulated everywhere else.
 
 #### macOS/Linux
@@ -112,7 +113,6 @@ mkxp-z provides limited support for some WinAPI functions that would normally br
 * `GetAsyncKeyState`: Emulated based on SDL mouse/key states.
 * `GetSystemPowerStatus`: Emulated based on SDL_GetPowerInfo.
 * `ShowWindow`: No-op.
-* `SetWindowLong`: No-op. Always returns `571`.
 * `GetSystemMetrics`: Only supports getting screen width/height.
 * `SetCapture`: No-op. Always returns `571`.
 * `ReleaseCapture`: No-op.
diff --git a/binding/miniffi-binding.cpp b/binding/miniffi-binding.cpp
index d3ab2259..9fddfa09 100644
--- a/binding/miniffi-binding.cpp
+++ b/binding/miniffi-binding.cpp
@@ -58,6 +58,7 @@ MiniFFI_GetFunctionHandle(void *libhandle, const char *func)
     CAPTURE(SetWindowTextA);
     CAPTURE(GetWindowRect);
     CAPTURE(RegisterHotKey);
+    CAPTURE(SetWindowLong);
     CAPTURE(GetKeyboardState);
 #ifndef __WIN32__  
     // Functions only needed on Linux and macOS go here
@@ -67,7 +68,6 @@ MiniFFI_GetFunctionHandle(void *libhandle, const char *func)
     CAPTURE(GetAsyncKeyState);
     CAPTURE(GetSystemPowerStatus);
     CAPTURE(ShowWindow);
-    CAPTURE(SetWindowLong);
     CAPTURE(GetSystemMetrics);
     CAPTURE(SetCapture);
     CAPTURE(ReleaseCapture);
diff --git a/src/fake-api.cpp b/src/fake-api.cpp
index ce3aee09..fa9d654b 100644
--- a/src/fake-api.cpp
+++ b/src/fake-api.cpp
@@ -334,6 +334,23 @@ MKXP_RegisterHotKey(HWND hWnd,
                     UINT vk)
 NOP_VAL(true)
 
+PREFABI LONG
+MKXP_SetWindowLong(HWND hWnd, int nIndex, LONG dwNewLong)
+{
+    if (nIndex == -16)
+    {
+        if (dwNewLong == 0)
+        {
+            shState->graphics().setFullscreen(true);
+        }
+        else if (dwNewLong == 0x14ca0000)
+        {
+            shState->graphics().setFullscreen(false);
+        }
+    }
+    return DUMMY_VAL;
+};
+
 // Shift key with GetKeyboardState doesn't work for whatever reason,
 // so Windows needs this too
 #define ks(sc) shState->eThread().keyStates[SDL_SCANCODE_##sc]
@@ -506,24 +523,6 @@ PREFABI BOOL
 MKXP_ShowWindow(HWND hWnd, int nCmdShow)
 NOP_VAL(true);
 
-PREFABI LONG
-MKXP_SetWindowLong(HWND hWnd, int nIndex, LONG dwNewLong)
-{
-    
-    if (nIndex == -16)
-    {
-        if (dwNewLong == 0)
-        {
-            shState->graphics().setFullscreen(true);
-        }
-        else if (dwNewLong == 0x14ca0000)
-        {
-            shState->graphics().setFullscreen(false);
-        }
-    }
-    return DUMMY_VAL;
-};
-
 
 // This only currently supports getting screen width/height
 // Not really motivated to do the other ones when I'll be
diff --git a/src/fake-api.h b/src/fake-api.h
index f2dad559..208950b1 100644
--- a/src/fake-api.h
+++ b/src/fake-api.h
@@ -102,6 +102,9 @@ MKXP_RegisterHotKey(HWND hWnd,
                     UINT fsModifiers,
                     UINT vk);
 
+PREFABI LONG
+MKXP_SetWindowLong(HWND hWnd, int nIndex, LONG dwNewLong);
+
 PREFABI BOOL
 MKXP_GetKeyboardState(PBYTE lpKeyState);
 
@@ -125,9 +128,6 @@ MKXP_GetSystemPowerStatus(LPSYSTEM_POWER_STATUS lpSystemPowerStatus);
 PREFABI BOOL
 MKXP_ShowWindow(HWND hWnd, int nCmdShow);
 
-PREFABI LONG
-MKXP_SetWindowLong(HWND hWnd, int nIndex, LONG dwNewLong);
-
 PREFABI int
 MKXP_GetSystemMetrics(int nIndex);