--- a/browser/config/mozconfigs/win32/mingw32
+++ b/browser/config/mozconfigs/win32/mingw32
@@ -45,24 +45,21 @@ ac_add_options --disable-stylo # Bug 139
 # These aren't supported on mingw at this time
 ac_add_options --disable-webrtc # Bug 1393901
 ac_add_options --disable-maintenance-service
 
 # Find our toolchain
 CC="$TOOLTOOL_DIR/mingw32/bin/i686-w64-mingw32-gcc"
 CXX="$TOOLTOOL_DIR/mingw32/bin/i686-w64-mingw32-g++"
 
-HOST_CC="$TOOLTOOL_DIR/gcc/bin/gcc"
-HOST_CXX="$TOOLTOOL_DIR/gcc/bin/g++"
-
 # We want to make sure we use binutils and other binaries in the tooltool
 # package.
-mk_add_options "export PATH=$TOOLTOOL_DIR/gcc/bin:$TOOLTOOL_DIR/mingw32/bin:$TOOLTOOL_DIR/wine/bin:$TOOLTOOL_DIR/upx/bin:$TOOLTOOL_DIR/fxc2/bin:$PATH"
+mk_add_options "export PATH=$TOOLTOOL_DIR/mingw32/bin:$TOOLTOOL_DIR/wine/bin:$TOOLTOOL_DIR/upx/bin:$TOOLTOOL_DIR/fxc2/bin:$PATH"
 
-LD_LIBRARY_PATH=${LD_LIBRARY_PATH:+$LD_LIBRARY_PATH:}$TOOLTOOL_DIR/gcc/lib64:$TOOLTOOL_DIR/mingw32/lib64
+LD_LIBRARY_PATH=${LD_LIBRARY_PATH:+$LD_LIBRARY_PATH:}$TOOLTOOL_DIR/mingw32/lib64
 mk_add_options "export LD_LIBRARY_PATH=$LD_LIBRARY_PATH"
 
 # Do not include the visual studio related mozconfigs of course
 
 ac_add_options --with-branding=browser/branding/nightly
 
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

--- a/taskcluster/ci/build/windows.yml
+++ b/taskcluster/ci/build/windows.yml
@@ -656,16 +656,15 @@ win32-mingw32/debug:
         using: mozharness
         actions: [build]
         script: mozharness/scripts/fx_desktop_build.py
         config:
             - builds/releng_base_firefox.py
             - builds/releng_base_windows_32_mingw_builds.py
         need-xvfb: false
     toolchains:
-        - linux64-gcc
         - mingw32-rust
         - linux64-upx
         - linux64-wine
         - linux64-sccache
         - linux64-mingw32-gcc
         - linux64-mingw32-nsis
         - linux64-mingw32-fxc2