diff --git a/reactos/lib/dinput/dinput_main.c b/reactos/lib/dinput/dinput_main.c
index cc12e7a22c2..93b0005028c 100644
--- a/reactos/lib/dinput/dinput_main.c
+++ b/reactos/lib/dinput/dinput_main.c
@@ -173,7 +173,7 @@ static const char *_dump_DIDEVTYPE_value(DWORD dwDevType) {
 	case DIDEVTYPE_KEYBOARD: return "DIDEVTYPE_KEYBOARD";
 	case DIDEVTYPE_JOYSTICK: return "DIDEVTYPE_JOYSTICK";
 	case DIDEVTYPE_DEVICE: return "DIDEVTYPE_DEVICE";
-	default: return "Unkown";
+	default: return "Unknown";
     }
 }
 
diff --git a/reactos/lib/dinput/effect_linuxinput.c b/reactos/lib/dinput/effect_linuxinput.c
index d86b0aca4bf..0a30d9bceea 100644
--- a/reactos/lib/dinput/effect_linuxinput.c
+++ b/reactos/lib/dinput/effect_linuxinput.c
@@ -823,7 +823,7 @@ HRESULT linuxinput_create_effect(
 	    HeapFree(GetProcessHeap(), 0, newEffect);
 	    return DIERR_INVALIDPARAM;
 	default:
-	    FIXME("Unkown force type.\n");
+	    FIXME("Unknown force type.\n");
             HeapFree(GetProcessHeap(), 0, newEffect);
 	    return DIERR_INVALIDPARAM;
     }
diff --git a/reactos/lib/dinput/joystick_linuxinput.c b/reactos/lib/dinput/joystick_linuxinput.c
index 750251355a0..b1c555835cb 100644
--- a/reactos/lib/dinput/joystick_linuxinput.c
+++ b/reactos/lib/dinput/joystick_linuxinput.c
@@ -637,7 +637,7 @@ static int find_property_offset(JoystickImpl *This, LPCDIPROPHEADER ph)
         return i;
       }
 
-      /* XXX - the following part wont work with LiveForSpeed
+      /* XXX - the following part won't work with LiveForSpeed
        * - the game sets the dwTypes to something else then
        * the ddoi.dwType set in EnumObjects
        */