diff --git a/run-tests.sh b/run-tests.sh
index 6d5e42a..ca4bd17 100755
--- a/run-tests.sh
+++ b/run-tests.sh
@@ -129,7 +129,7 @@ set_native() {
 
 if [ -z "$RUN_X86_64" ] && [ -z "$RUN_I686" ] && [ -z "$RUN_ARMV7" ] && [ -z "$RUN_AARCH64" ]; then
     case $(uname) in
-    MINGW*|MSYS*)
+    MINGW*|MSYS*|CYGWIN*)
         # On Windows/arm64, we may be running x86_64 msys2 emulated, so we
         # can't rely on "uname -m" here. But the msys2 "uname" output indicates
         # the real host architecture, and the Windows build version.
diff --git a/test-libcxx-module.sh b/test-libcxx-module.sh
index 3a42a5c..4fe3856 100755
--- a/test-libcxx-module.sh
+++ b/test-libcxx-module.sh
@@ -27,7 +27,7 @@ export PATH=$PREFIX/bin:$PATH
 : ${ARCHS:=${TOOLCHAIN_ARCHS-i686 x86_64 armv7 aarch64}}
 
 case $(uname) in
-MINGW*|MSYS*)
+MINGW*|MSYS*|CYGWIN*)
     NATIVE=1
     ;;
 *)