diff --git a/src/engine/client/input.cpp b/src/engine/client/input.cpp
index be7b641a3..6c201a192 100644
--- a/src/engine/client/input.cpp
+++ b/src/engine/client/input.cpp
@@ -224,6 +224,8 @@ int CInput::Update()
 				case SDL_MOUSEWHEEL:
 					if(Event.wheel.y > 0) Key = KEY_MOUSE_WHEEL_UP; // ignore_convention
 					if(Event.wheel.y < 0) Key = KEY_MOUSE_WHEEL_DOWN; // ignore_convention
+					if(Event.wheel.x > 0) Key = KEY_MOUSE_WHEEL_LEFT; // ignore_convention
+					if(Event.wheel.x < 0) Key = KEY_MOUSE_WHEEL_RIGHT; // ignore_convention
 					Action |= IInput::FLAG_RELEASE;
 					Scancode = Key;
 					break;
diff --git a/src/engine/client/keynames.h b/src/engine/client/keynames.h
index de98b03ad..56930626e 100644
--- a/src/engine/client/keynames.h
+++ b/src/engine/client/keynames.h
@@ -428,8 +428,8 @@ const char g_aaKeyStrings[512][20] =
 	"mouse9",
 	"mousewheelup",
 	"mousewheeldown",
-	"&422",
-	"&423",
+	"mousewheelleft",
+	"mousewheelright",
 	"&424",
 	"&425",
 	"&426",
diff --git a/src/engine/keys.h b/src/engine/keys.h
index 9f3770945..37a873e46 100644
--- a/src/engine/keys.h
+++ b/src/engine/keys.h
@@ -254,6 +254,8 @@ enum
 	KEY_MOUSE_9 = 419,
 	KEY_MOUSE_WHEEL_UP = 420,
 	KEY_MOUSE_WHEEL_DOWN = 421,
+	KEY_MOUSE_WHEEL_LEFT = 422,
+	KEY_MOUSE_WHEEL_RIGHT = 423,
 	KEY_LAST,
 };