diff --git a/DiabloUI/diabloui.h b/DiabloUI/diabloui.h
index 349307aec..be52d82de 100644
--- a/DiabloUI/diabloui.h
+++ b/DiabloUI/diabloui.h
@@ -35,7 +35,7 @@ BOOL __stdcall UiSelHeroMultDialog(BOOL(__stdcall *fninfo)(BOOL(__stdcall *fninf
 BOOL __stdcall UiSelHeroSingDialog(BOOL(__stdcall *fninfo)(BOOL(__stdcall *fninfofunc)(_uiheroinfo *)), BOOL(__stdcall *fncreate)(_uiheroinfo *), BOOL(__stdcall *fnremove)(_uiheroinfo *), BOOL(__stdcall *fnstats)(unsigned int, _uidefaultstats *), int *dlgresult, char *name, int *difficulty);
 BOOL __stdcall UiCreditsDialog(int a1);
 BOOL __stdcall UiMainMenuDialog(char *name, int *pdwResult, void(__stdcall *fnSound)(char *file), int a4);
-int __stdcall UiProgressDialog(HWND window, char *msg, int a3, void *fnfunc, int a5);
+BOOL __stdcall UiProgressDialog(HWND window, char *msg, int enable, int(*fnfunc)(), int rate);
 int __stdcall UiProfileGetString();
 void __cdecl UiProfileCallback();
 void __cdecl UiProfileDraw();
diff --git a/DiabloUI/progress.cpp b/DiabloUI/progress.cpp
index 7edaeb52f..dccfcf8b2 100644
--- a/DiabloUI/progress.cpp
+++ b/DiabloUI/progress.cpp
@@ -10,7 +10,7 @@ signed int Progress_10009480() { return 0; }
 // 1002A2EC: using guessed type int dword_1002A2EC;
 
 // ref: 0x1000948B
-int __stdcall UiProgressDialog(HWND window, char *msg, int a3, void *fnfunc, int a5) { return 0; }
+BOOL __stdcall UiProgressDialog(HWND window, char *msg, int enable, int(*fnfunc)(), int rate) { return 0; }
 /* {
 	HWND v5; // eax
 	BOOL result; // eax