diff --git a/win32/winutil.c b/win32/winutil.c
index 1f467c98642..000d923233a 100644
--- a/win32/winutil.c
+++ b/win32/winutil.c
@@ -22,7 +22,7 @@
 #include "php.h"
 #include <wincrypt.h>
 
-PHPAPI char *php_win32_error_to_msg(int error)
+PHPAPI char *php_win32_error_to_msg(HRESULT error)
 {
 	char *buf = NULL;
 
diff --git a/win32/winutil.h b/win32/winutil.h
index 3292174fc38..b9707da1294 100644
--- a/win32/winutil.h
+++ b/win32/winutil.h
@@ -16,7 +16,7 @@
    +----------------------------------------------------------------------+
  */
 
-PHPAPI char *php_win32_error_to_msg(int error);
+PHPAPI char *php_win32_error_to_msg(HRESULT error);
 
 #define php_win_err()	php_win32_error_to_msg(GetLastError())
 int php_win32_check_trailing_space(const char * path, const zend_str_size_int path_len);