diff --git a/docs/feature_mouse_keys.md b/docs/feature_mouse_keys.md
index 992849313755..eed4f4f4aaaf 100644
--- a/docs/feature_mouse_keys.md
+++ b/docs/feature_mouse_keys.md
@@ -29,6 +29,9 @@ In your keymap you can use the following keycodes to map key presses to mouse ac
 |`KC_MS_BTN3`    |`KC_BTN3`|Press button 3   |
 |`KC_MS_BTN4`    |`KC_BTN4`|Press button 4   |
 |`KC_MS_BTN5`    |`KC_BTN5`|Press button 5   |
+|`KC_MS_BTN6`    |`KC_BTN6`|Press button 6   |
+|`KC_MS_BTN7`    |`KC_BTN7`|Press button 7   |
+|`KC_MS_BTN8`    |`KC_BTN8`|Press button 8   |
 |`KC_MS_WH_UP`   |`KC_WH_U`|Move wheel up    |
 |`KC_MS_WH_DOWN` |`KC_WH_D`|Move wheel down  |
 |`KC_MS_WH_LEFT` |`KC_WH_L`|Move wheel left  |
diff --git a/docs/feature_pointing_device.md b/docs/feature_pointing_device.md
index dd7d5fae0be9..909eff826de1 100644
--- a/docs/feature_pointing_device.md
+++ b/docs/feature_pointing_device.md
@@ -382,7 +382,7 @@ The report_mouse_t (here "mouseReport") has the following properties:
 * `mouseReport.y` - this is a signed int from -127 to 127 (not 128, this is defined in USB HID spec) representing movement (+ upward, - downward) on the y axis.
 * `mouseReport.v` - this is a signed int from -127 to 127 (not 128, this is defined in USB HID spec) representing vertical scrolling (+ upward, - downward).
 * `mouseReport.h` - this is a signed int from -127 to 127 (not 128, this is defined in USB HID spec) representing horizontal scrolling (+ right, - left).
-* `mouseReport.buttons` - this is a uint8_t in which the last 5 bits are used.  These bits represent the mouse button state - bit 3 is mouse button 5, and bit 7 is mouse button 1.
+* `mouseReport.buttons` - this is a uint8_t in which all 8 bits are used.  These bits represent the mouse button state - bit 0 is mouse button 1, and bit 7 is mouse button 8.
 
 To manually manipulate the mouse reports outside of the `pointing_device_task_*` functions, you can use:
 
diff --git a/docs/ja/feature_mouse_keys.md b/docs/ja/feature_mouse_keys.md
index 74b09e939b73..e4fa9dfb456a 100644
--- a/docs/ja/feature_mouse_keys.md
+++ b/docs/ja/feature_mouse_keys.md
@@ -34,6 +34,9 @@ MOUSEKEY_ENABLE = yes
 | `KC_MS_BTN3` | `KC_BTN3` | ボタン3を押す |
 | `KC_MS_BTN4` | `KC_BTN4` | ボタン4を押す |
 | `KC_MS_BTN5` | `KC_BTN5` | ボタン5を押す |
+| `KC_MS_BTN6` | `KC_BTN6` | ボタン6を押す |
+| `KC_MS_BTN7` | `KC_BTN7` | ボタン7を押す |
+| `KC_MS_BTN8` | `KC_BTN8` | ボタン8を押す |
 | `KC_MS_WH_UP` | `KC_WH_U` | ホイールを向こう側に回転 |
 | `KC_MS_WH_DOWN` | `KC_WH_D` | ホイールを手前側に回転 |
 | `KC_MS_WH_LEFT` | `KC_WH_L` | ホイールを左に倒す |
diff --git a/quantum/mousekey.c b/quantum/mousekey.c
index db7b69b7a113..735a6e45ba85 100644
--- a/quantum/mousekey.c
+++ b/quantum/mousekey.c
@@ -410,16 +410,8 @@ void mousekey_on(uint8_t code) {
         mouse_report.h = wheel_unit() * -1;
     else if (code == KC_MS_WH_RIGHT)
         mouse_report.h = wheel_unit();
-    else if (code == KC_MS_BTN1)
-        mouse_report.buttons |= MOUSE_BTN1;
-    else if (code == KC_MS_BTN2)
-        mouse_report.buttons |= MOUSE_BTN2;
-    else if (code == KC_MS_BTN3)
-        mouse_report.buttons |= MOUSE_BTN3;
-    else if (code == KC_MS_BTN4)
-        mouse_report.buttons |= MOUSE_BTN4;
-    else if (code == KC_MS_BTN5)
-        mouse_report.buttons |= MOUSE_BTN5;
+    else if (IS_MOUSEKEY_BUTTON(code))
+        mouse_report.buttons |= 1 << (code - KC_MS_BTN1);
     else if (code == KC_MS_ACCEL0)
         mousekey_accel |= (1 << 0);
     else if (code == KC_MS_ACCEL1)
@@ -462,16 +454,8 @@ void mousekey_off(uint8_t code) {
         mouse_report.h = 0;
     else if (code == KC_MS_WH_RIGHT && mouse_report.h > 0)
         mouse_report.h = 0;
-    else if (code == KC_MS_BTN1)
-        mouse_report.buttons &= ~MOUSE_BTN1;
-    else if (code == KC_MS_BTN2)
-        mouse_report.buttons &= ~MOUSE_BTN2;
-    else if (code == KC_MS_BTN3)
-        mouse_report.buttons &= ~MOUSE_BTN3;
-    else if (code == KC_MS_BTN4)
-        mouse_report.buttons &= ~MOUSE_BTN4;
-    else if (code == KC_MS_BTN5)
-        mouse_report.buttons &= ~MOUSE_BTN5;
+    else if (IS_MOUSEKEY_BUTTON(code))
+        mouse_report.buttons &= ~(1 << (code - KC_MS_BTN1));
     else if (code == KC_MS_ACCEL0)
         mousekey_accel &= ~(1 << 0);
     else if (code == KC_MS_ACCEL1)
@@ -574,16 +558,8 @@ void mousekey_on(uint8_t code) {
         mouse_report.h = w_offset * -1;
     else if (code == KC_MS_WH_RIGHT)
         mouse_report.h = w_offset;
-    else if (code == KC_MS_BTN1)
-        mouse_report.buttons |= MOUSE_BTN1;
-    else if (code == KC_MS_BTN2)
-        mouse_report.buttons |= MOUSE_BTN2;
-    else if (code == KC_MS_BTN3)
-        mouse_report.buttons |= MOUSE_BTN3;
-    else if (code == KC_MS_BTN4)
-        mouse_report.buttons |= MOUSE_BTN4;
-    else if (code == KC_MS_BTN5)
-        mouse_report.buttons |= MOUSE_BTN5;
+    else if (IS_MOUSEKEY_BUTTON(code))
+        mouse_report.buttons |= 1 << (code - KC_MS_BTN1);
     else if (code == KC_MS_ACCEL0)
         mk_speed = mkspd_0;
     else if (code == KC_MS_ACCEL1)
@@ -613,16 +589,8 @@ void mousekey_off(uint8_t code) {
         mouse_report.h = 0;
     else if (code == KC_MS_WH_RIGHT && mouse_report.h > 0)
         mouse_report.h = 0;
-    else if (code == KC_MS_BTN1)
-        mouse_report.buttons &= ~MOUSE_BTN1;
-    else if (code == KC_MS_BTN2)
-        mouse_report.buttons &= ~MOUSE_BTN2;
-    else if (code == KC_MS_BTN3)
-        mouse_report.buttons &= ~MOUSE_BTN3;
-    else if (code == KC_MS_BTN4)
-        mouse_report.buttons &= ~MOUSE_BTN4;
-    else if (code == KC_MS_BTN5)
-        mouse_report.buttons &= ~MOUSE_BTN5;
+    else if (IS_MOUSEKEY_BUTTON(code))
+        mouse_report.buttons &= ~(1 << (code - KC_MS_BTN1));
 #    ifdef MK_MOMENTARY_ACCEL
     else if (code == KC_MS_ACCEL0)
         mk_speed = mkspd_DEFAULT;
diff --git a/tmk_core/protocol/report.h b/tmk_core/protocol/report.h
index b61531580970..9d415a3bfd7c 100644
--- a/tmk_core/protocol/report.h
+++ b/tmk_core/protocol/report.h
@@ -38,11 +38,14 @@ enum hid_report_ids {
 /* Mouse buttons */
 #define MOUSE_BTN_MASK(n) (1 << (n))
 enum mouse_buttons {
-    MOUSE_BTN1 = (1 << 0),
-    MOUSE_BTN2 = (1 << 1),
-    MOUSE_BTN3 = (1 << 2),
-    MOUSE_BTN4 = (1 << 3),
-    MOUSE_BTN5 = (1 << 4)
+    MOUSE_BTN1 = MOUSE_BTN_MASK(0),
+    MOUSE_BTN2 = MOUSE_BTN_MASK(1),
+    MOUSE_BTN3 = MOUSE_BTN_MASK(2),
+    MOUSE_BTN4 = MOUSE_BTN_MASK(3),
+    MOUSE_BTN5 = MOUSE_BTN_MASK(4),
+    MOUSE_BTN6 = MOUSE_BTN_MASK(5),
+    MOUSE_BTN7 = MOUSE_BTN_MASK(6),
+    MOUSE_BTN8 = MOUSE_BTN_MASK(7)
 };
 
 /* Consumer Page (0x0C)
diff --git a/tmk_core/protocol/usb_descriptor.c b/tmk_core/protocol/usb_descriptor.c
index bc8d36cf3a2e..5ab9e3ff4f56 100644
--- a/tmk_core/protocol/usb_descriptor.c
+++ b/tmk_core/protocol/usb_descriptor.c
@@ -120,19 +120,15 @@ const USB_Descriptor_HIDReport_Datatype_t PROGMEM SharedReport[] = {
 #    endif
         HID_RI_USAGE(8, 0x01),             // Pointer
         HID_RI_COLLECTION(8, 0x00),        // Physical
-            // Buttons (5 bits)
+            // Buttons (8 bits)
             HID_RI_USAGE_PAGE(8, 0x09),    // Button
             HID_RI_USAGE_MINIMUM(8, 0x01), // Button 1
-            HID_RI_USAGE_MAXIMUM(8, 0x05), // Button 5
+            HID_RI_USAGE_MAXIMUM(8, 0x08), // Button 8
             HID_RI_LOGICAL_MINIMUM(8, 0x00),
             HID_RI_LOGICAL_MAXIMUM(8, 0x01),
-            HID_RI_REPORT_COUNT(8, 0x05),
+            HID_RI_REPORT_COUNT(8, 0x08),
             HID_RI_REPORT_SIZE(8, 0x01),
             HID_RI_INPUT(8, HID_IOF_DATA | HID_IOF_VARIABLE | HID_IOF_ABSOLUTE),
-            // Button padding (3 bits)
-            HID_RI_REPORT_COUNT(8, 0x01),
-            HID_RI_REPORT_SIZE(8, 0x03),
-            HID_RI_INPUT(8, HID_IOF_CONSTANT),
 
 #    ifdef MOUSE_EXTENDED_REPORT
             // Boot protocol XY ignored in Report protocol