diff --git a/src/wx-utils.cc b/src/wx-utils.cc
index c13cce6..db4c624 100644
--- a/src/wx-utils.cc
+++ b/src/wx-utils.cc
@@ -273,7 +273,7 @@ int wx_dlgdirselectex(void* window, LONG_PARAM path, int count, int id)
         return FALSE;
 }
 
-int wx_sendmessage(void* window, int type, INT_PARAM param1, LONG_PARAM param2)
+int wx_sendmessage(void* window, int type, LONG_PARAM param1, LONG_PARAM param2)
 {
         switch (type)
         {
diff --git a/src/wx-utils.h b/src/wx-utils.h
index fd00931..945d54f 100644
--- a/src/wx-utils.h
+++ b/src/wx-utils.h
@@ -35,7 +35,7 @@ extern "C" {
         int wx_dlgdirselectex(void* window, LONG_PARAM path, int count, int id);
 
         void wx_setwindowtitle(void* window, char* s);
-        int wx_sendmessage(void* window, int type, INT_PARAM param1, LONG_PARAM param2);
+        int wx_sendmessage(void* window, int type, LONG_PARAM param1, LONG_PARAM param2);
         void* wx_getdlgitem(void* window, int id);
         void wx_setdlgitemtext(void* window, int id, char* str);
         void wx_enablewindow(void* window, int enabled);