diff --git a/mingw-w64-crt/lib32/msvcr80.def.in b/mingw-w64-crt/lib32/msvcr80.def.in
index c1328aa..ce46ba1 100644
--- a/mingw-w64-crt/lib32/msvcr80.def.in
+++ b/mingw-w64-crt/lib32/msvcr80.def.in
@@ -277,6 +277,7 @@
 _loaddll
 _local_unwind2
 _lock
+_lock_file
 _locking
 _logb
 _longjmpex
@@ -382,6 +383,7 @@
 _searchenv
 _seh_longjmp_unwind
 _set_error_mode
+_set_invalid_parameter_handler
 _set_sbh_threshold
 _seterrormode
 _setjmp
@@ -443,6 +445,7 @@
 _unlink
 _unloaddll
 _unlock
+_unlock_file
 _utime
 _vsnprintf
 _vsnwprintf
diff --git a/mingw-w64-crt/lib64/msvcr80.def.in b/mingw-w64-crt/lib64/msvcr80.def.in
index c1ef3f0..136a097 100644
--- a/mingw-w64-crt/lib64/msvcr80.def.in
+++ b/mingw-w64-crt/lib64/msvcr80.def.in
@@ -373,6 +373,7 @@
 _localtime64
 localtime == _localtime64
 _lock
+_lock_file
 _locking
 _logb
 _logbf
@@ -482,6 +483,7 @@
 _scwprintf
 _searchenv
 _set_error_mode
+_set_invalid_parameter_handler
 _set_sbh_threshold
 _seterrormode
 _setjmp
@@ -550,6 +552,7 @@
 _unlink
 _unloaddll
 _unlock
+_unlock_file
 _utime
 _utime64
 _vscprintf