diff --git a/.github/configs b/.github/configs
index df7ae28c4..44b607a37 100755
--- a/.github/configs
+++ b/.github/configs
@@ -135,4 +135,9 @@ fi
 
 CONFIGFLAGS="${CONFIGFLAGS} ${LIBCRYPTOFLAGS}"
 
+if [ -x "$(which plink 2>/dev/null)" ]; then
+	REGRESS_INTEROP_PUTTY=yes
+	export REGRESS_INTEROP_PUTTY
+fi
+
 export LTESTS SUDO TEST_TARGET TEST_SSH_UNSAFE_PERMISSIONS
diff --git a/.github/setup_ci.sh b/.github/setup_ci.sh
index 569502527..72b545ce5 100755
--- a/.github/setup_ci.sh
+++ b/.github/setup_ci.sh
@@ -53,6 +53,7 @@ for TARGET in $TARGETS; do
           1.*)	INSTALL_OPENSSL="OpenSSL_$(echo ${INSTALL_OPENSSL} | tr . _)" ;;
           3.*)	INSTALL_OPENSSL="openssl-${INSTALL_OPENSSL}" ;;
         esac
+        PACKAGES="${PACKAGES} putty-tools"
        ;;
     libressl-*)
         INSTALL_LIBRESSL=$(echo ${TARGET} | cut -f2 -d-)
@@ -60,6 +61,7 @@ for TARGET in $TARGETS; do
           master) ;;
           *) INSTALL_LIBRESSL="v$(echo ${TARGET} | cut -f2 -d-)" ;;
         esac
+        PACKAGES="${PACKAGES} putty-tools"
        ;;
     valgrind*)
        PACKAGES="$PACKAGES valgrind"