diff --git a/mingw-headers.spec b/mingw-headers.spec
index f1e9209..2da65b2 100644
--- a/mingw-headers.spec
+++ b/mingw-headers.spec
@@ -5,24 +5,11 @@
 
 #%%global pre rc2
 
-# The mingw-w64-headers provide the headers pthread_time.h
-# and pthread_unistd.h by default and are dummy headers.
-# The real implementation for these headers is in a separate
-# library called winpthreads. As long as winpthreads isn't
-# available (and the old pthreads-w32 implementation is used)
-# the flag below needs to be set to 1. When winpthreads is
-# available then this flag needs to be set to 0 to avoid
-# a file conflict with the winpthreads headers
-# Winpthreads is available as of Fedora 20
-%if 0%{?fedora} >= 20 || 0%{?rhel} >= 7
-%global bundle_dummy_pthread_headers 0
-%else
 %global bundle_dummy_pthread_headers 1
-%endif
 
 Name:           mingw-headers
 Version:        6.0.0
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Win32/Win64 header files
 
 License:        Public Domain and LGPLv2+ and ZPLv2.1
@@ -122,5 +109,8 @@ rm -f %{buildroot}%{mingw64_includedir}/pthread_unistd.h
 
 
 %changelog
+* Fri Oct 16 2020 Zhiyi Weng <zhiyi@iscas.ac.cn> - 6.0.0-4
+- Set bundle_dummy_pthread_headers to 1
+
 * Fri Oct 09 2020 Zhiyi Weng <zhiyi@iscas.ac.cn> - 6.0.0-3
 - Initial version.