diff --git a/tests/data/test3021 b/tests/data/test3021
index bd6ae8d6dc..1b23ff0482 100644
--- a/tests/data/test3021
+++ b/tests/data/test3021
@@ -30,6 +30,11 @@ SFTP correct sha256 host key
  <command>
 --hostpubsha256 %SSHSRVSHA256 --key curl_client_key --pubkey curl_client_key.pub -u %USER: sftp://%HOSTIP:%SSHPORT%SSH_PWD/log/file%TESTNUMBER.txt
 </command>
+<setenv>
+# Needed for MSYS2 to not treat the argument as a POSIX path list
+# that has to be converted to Windows paths
+MSYS2_ARG_CONV_EXCL=/
+</setenv>
 <file name="log/file%TESTNUMBER.txt">
 test
 </file>
diff --git a/tests/data/test3022 b/tests/data/test3022
index db24ca9f4a..3e117701ad 100644
--- a/tests/data/test3022
+++ b/tests/data/test3022
@@ -30,6 +30,11 @@ SCP correct sha256 host key
  <command>
 --hostpubsha256 %SSHSRVSHA256 --key curl_client_key --pubkey curl_client_key.pub -u %USER: scp://%HOSTIP:%SSHPORT%SSH_PWD/log/file%TESTNUMBER.txt
 </command>
+<setenv>
+# Needed for MSYS2 to not treat the argument as a POSIX path list
+# that has to be converted to Windows paths
+MSYS2_ARG_CONV_EXCL=/
+</setenv>
 <file name="log/file%TESTNUMBER.txt">
 test
 </file>