diff --git a/src/os_win32.h b/src/os_win32.h
index f672ea8..6869747 100644
--- a/src/os_win32.h
+++ b/src/os_win32.h
@@ -201,7 +201,7 @@
 
 #ifndef PROTO
 
-/* Enable common dialogs input unicode from IME if posible. */
+/* Enable common dialogs input unicode from IME if possible. */
 #ifdef FEAT_MBYTE
     /* The variables are defined in os_win32.c. */
 extern LRESULT (WINAPI *pDispatchMessage)(CONST MSG *);