diff --git a/src/components/views/rooms/MemberInfo.js b/src/components/views/rooms/MemberInfo.js
index a711314709..33d59e0467 100644
--- a/src/components/views/rooms/MemberInfo.js
+++ b/src/components/views/rooms/MemberInfo.js
@@ -440,40 +440,57 @@ module.exports = withMatrixClient(React.createClass({
         const roomId = this.props.member.roomId;
         const target = this.props.member.userId;
         const room = this.props.matrixClient.getRoom(roomId);
-        const self = this;
-        if (!room) {
-            return;
-        }
-        const powerLevelEvent = room.currentState.getStateEvents(
-            "m.room.power_levels", "",
-        );
-        if (!powerLevelEvent) {
-            return;
-        }
-        if (powerLevelEvent.getContent().users) {
-            const myPower = powerLevelEvent.getContent().users[this.props.matrixClient.credentials.userId];
-            if (parseInt(myPower) === parseInt(powerLevel)) {
-                const QuestionDialog = sdk.getComponent("dialogs.QuestionDialog");
-                Modal.createTrackedDialog('Promote to PL100 Warning', '', QuestionDialog, {
-                    title: _t("Warning!"),
-                    description:
-                        <div>
-                            { _t("You will not be able to undo this change as you are promoting the user to have the same power level as yourself.") }<br />
-                            { _t("Are you sure?") }
-                        </div>,
-                    button: _t("Continue"),
-                    onFinished: function(confirmed) {
-                        if (confirmed) {
-                            self._applyPowerChange(roomId, target, powerLevel, powerLevelEvent);
-                        }
-                    },
-                });
-            } else {
-                this._applyPowerChange(roomId, target, powerLevel, powerLevelEvent);
-            }
-        } else {
+        if (!room) return;
+
+        const powerLevelEvent = room.currentState.getStateEvents("m.room.power_levels", "");
+        if (!powerLevelEvent) return;
+
+        if (!powerLevelEvent.getContent().users) {
             this._applyPowerChange(roomId, target, powerLevel, powerLevelEvent);
+            return;
         }
+
+        const myUserId = this.props.matrixClient.getUserId();
+        const QuestionDialog = sdk.getComponent("dialogs.QuestionDialog");
+
+        // If we are changing our own PL it can only ever be decreasing, which we cannot reverse.
+        if (myUserId === target) {
+            Modal.createTrackedDialog('Demoting Self', '', QuestionDialog, {
+                title: _t("Warning!"),
+                description:
+                    <div>
+                        { _t("You will not be able to undo this change as you are demoting yourself, if you are the last privileged user in the room it will be impossible to regain privileges.") }<br />
+                        { _t("Are you sure?") }
+                    </div>,
+                button: _t("Continue"),
+                onFinished: (confirmed) => {
+                    if (confirmed) {
+                        this._applyPowerChange(roomId, target, powerLevel, powerLevelEvent);
+                    }
+                },
+            });
+            return;
+        }
+
+        const myPower = powerLevelEvent.getContent().users[myUserId];
+        if (parseInt(myPower) === parseInt(powerLevel)) {
+            Modal.createTrackedDialog('Promote to PL100 Warning', '', QuestionDialog, {
+                title: _t("Warning!"),
+                description:
+                    <div>
+                        { _t("You will not be able to undo this change as you are promoting the user to have the same power level as yourself.") }<br />
+                        { _t("Are you sure?") }
+                    </div>,
+                button: _t("Continue"),
+                onFinished: (confirmed) => {
+                    if (confirmed) {
+                        this._applyPowerChange(roomId, target, powerLevel, powerLevelEvent);
+                    }
+                },
+            });
+            return;
+        }
+        this._applyPowerChange(roomId, target, powerLevel, powerLevelEvent);
     },
 
     onNewDMClick: function() {
diff --git a/src/i18n/strings/en_EN.json b/src/i18n/strings/en_EN.json
index f28322398c..9cf60461cc 100644
--- a/src/i18n/strings/en_EN.json
+++ b/src/i18n/strings/en_EN.json
@@ -273,6 +273,7 @@
     "Failed to toggle moderator status": "Failed to toggle moderator status",
     "Failed to change power level": "Failed to change power level",
     "You will not be able to undo this change as you are promoting the user to have the same power level as yourself.": "You will not be able to undo this change as you are promoting the user to have the same power level as yourself.",
+    "You will not be able to undo this change as you are demoting yourself, if you are the last privileged user in the room it will be impossible to regain privileges.": "You will not be able to undo this change as you are demoting yourself, if you are the last privileged user in the room it will be impossible to regain privileges.",
     "Are you sure?": "Are you sure?",
     "No devices with registered encryption keys": "No devices with registered encryption keys",
     "Devices": "Devices",