diff --git a/include/NCursesPtyWindow/Window.hpp b/include/NCursesPtyWindow/Window.hpp
index 938c929..fb91c63 100644
--- a/include/NCursesPtyWindow/Window.hpp
+++ b/include/NCursesPtyWindow/Window.hpp
@@ -11,25 +11,25 @@
 #include <ncursesw/cursesw.h>
 
 #ifdef addnwstr
-inline void UNDEF(addnwstr)(const wchar_t *wstr, int n) { addnwstr(wstr, n); }
+inline int UNDEF(addnwstr)(const wchar_t *wstr, int n) { addnwstr(wstr, n); }
 #undef addnwstr
 #define addnwstr UNDEF(addnwstr)
 #endif
 
 #ifdef add_wch
-inline void UNDEF(add_wch)(const cchar_t *character) { add_wch(character); }
+inline int UNDEF(add_wch)(const cchar_t *character) { add_wch(character); }
 #undef add_wch
 #define add_wch UNDEF(add_wch)
 #endif
 
 #ifdef ins_wch
-inline void UNDEF(ins_wch)(cchar_t *character) { ins_wch(character); }
+inline int UNDEF(ins_wch)(cchar_t *character) { ins_wch(character); }
 #undef ins_wch
 #define ins_wch UNDEF(ins_wch)
 #endif
 
 #ifdef get_wch
-inline void UNDEF(get_wch)(wint_t *character) { get_wch(character); }
+inline int UNDEF(get_wch)(wint_t *character) { get_wch(character); }
 #undef get_wch
 #define get_wch UNDEF(get_wch)
 #endif