diff --git a/README.md b/README.md
index 0cf76d75..e6c6b361 100644
--- a/README.md
+++ b/README.md
@@ -106,8 +106,6 @@ GLFW bundles a number of dependencies in the `deps/` directory.
                    bit field was unchanged
  - [Cocoa] Bugfix: Joystick enumeration took hundreds of ms on some systems
  - [Cocoa] Bugfix: The cursor was hidden when the user resized a GLFW window
- - [Cocoa] Bugfix: The X-axis scroll offsets were inverted relative to the
-                   Windows and X11 ports
  - [Win32] Enabled generation of pkg-config file for MinGW
  - [Win32] Removed option to require explicitly linking against `winmm.dll`
  - [Win32] Bugfix: Failure to load winmm or its functions was not reported to
@@ -122,6 +120,7 @@ GLFW bundles a number of dependencies in the `deps/` directory.
                    specified monitor
  - [Win32] Bugfix: The wrong incorrect physical size was returned for
                    non-primary monitors
+ - [Win32] Bugfix: X-axis scroll offsets were inverted
  - [X11] Added run-time support for systems lacking the XKB extension
  - [X11] Made GLX 1.3 the minimum supported version
  - [X11] Replaced `XRRGetScreenResources` with `XRRGetScreenResourcesCurrent`
@@ -140,6 +139,7 @@ GLFW bundles a number of dependencies in the `deps/` directory.
  - [X11] Bugfix: The name pointer of joysticks were not cleared on disconnection
  - [X11] Bugfix: Video mode dimensions were not rotated to match the CRTC
  - [X11] Bugfix: Unicode character input ignored dead keys
+ - [X11] Bugfix: X-axis scroll offsets were inverted
 
 
 ## Contact
diff --git a/src/cocoa_window.m b/src/cocoa_window.m
index dd7b012f..3fec6db0 100644
--- a/src/cocoa_window.m
+++ b/src/cocoa_window.m
@@ -687,7 +687,7 @@ static int translateKey(unsigned int key)
         // NOTE: The X-axis is inverted for consistency with Windows and X11.
         //       Natural scrolling inverts both axes, making it consistent with
         //       the similarly named feature on modern X11 desktop systems.
-        _glfwInputScroll(window, -deltaX, deltaY);
+        _glfwInputScroll(window, deltaX, deltaY);
     }
 }
 
diff --git a/src/win32_window.c b/src/win32_window.c
index fbdf03ae..a15c38c8 100644
--- a/src/win32_window.c
+++ b/src/win32_window.c
@@ -728,7 +728,7 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
         case WM_MOUSEHWHEEL:
         {
             // This message is only sent on Windows Vista and later
-            _glfwInputScroll(window, (SHORT) HIWORD(wParam) / (double) WHEEL_DELTA, 0.0);
+            _glfwInputScroll(window, -((SHORT) HIWORD(wParam) / (double) WHEEL_DELTA), 0.0);
             return 0;
         }
 
diff --git a/src/x11_window.c b/src/x11_window.c
index dfc303fd..8fa6c972 100644
--- a/src/x11_window.c
+++ b/src/x11_window.c
@@ -949,9 +949,9 @@ static void processEvent(XEvent *event)
             else if (event->xbutton.button == Button5)
                 _glfwInputScroll(window, 0.0, -1.0);
             else if (event->xbutton.button == Button6)
-                _glfwInputScroll(window, -1.0, 0.0);
-            else if (event->xbutton.button == Button7)
                 _glfwInputScroll(window, 1.0, 0.0);
+            else if (event->xbutton.button == Button7)
+                _glfwInputScroll(window, -1.0, 0.0);
 
             else
             {