diff --git a/libs/ardour/wscript b/libs/ardour/wscript
index 1092963b11..9ad541c15f 100644
--- a/libs/ardour/wscript
+++ b/libs/ardour/wscript
@@ -547,6 +547,10 @@ def build(bld):
             avx512f_cxxflags.append (bld.env['compiler_flags_dict']['avx'])
             avx512f_cxxflags.append (bld.env['compiler_flags_dict']['pic'])
             avx512f_cxxflags.append (bld.env['compiler_flags_dict']['fma'])
+            # work around issue with mingc/gcc-8
+            # https://stackoverflow.com/questions/43152633/invalid-register-for-seh-savexmm-in-cygwin
+            if bld.env['build_target'] == 'mingw':
+                avx512f_cxxflags.append ('-fno-asynchronous-unwind-tables')
 
             bld(features = 'cxx cxxstlib asm',
                 source   = avx512f_sources,
diff --git a/wscript b/wscript
index 0d3943641c..6b2979d9be 100644
--- a/wscript
+++ b/wscript
@@ -520,6 +520,7 @@ int main() { return 0; }''',
         elif conf.env['build_target'] == 'mingw':
             if re.search ('x86_64-w64', str(conf.env['CC'])) is not None:
                 conf.define ('FPU_AVX_FMA_SUPPORT', 1)
+                conf.define ('FPU_AVX512F_SUPPORT', 1)
         elif conf.env['build_target'] == 'i386' or conf.env['build_target'] == 'i686' or conf.env['build_target'] == 'x86_64':
             conf.check_cxx(fragment = "#include <immintrin.h>\nint main(void) { __m512 a; _mm512_abs_ps(a); _mm512_fmadd_ps(a, a, a); (void) _mm512_reduce_min_ps(a); (void)_mm512_reduce_max_ps(a); return 0; }\n",
                            features  = ['cxx'],