diff --git a/lib/vssh/libssh.c b/lib/vssh/libssh.c
index 0faf830768..bbe1a7aec6 100644
--- a/lib/vssh/libssh.c
+++ b/lib/vssh/libssh.c
@@ -566,6 +566,8 @@ static int myssh_in_SFTP_QUOTE_STATVFS(struct Curl_easy *data,
   else if(statvfs) {
 #ifdef _MSC_VER
 #define CURL_LIBSSH_VFS_SIZE_MASK "I64u"
+#elif defined(__MINGW32__) && (__MINGW64_VERSION_MAJOR <= 6)
+#define CURL_LIBSSH_VFS_SIZE_MASK "llu"
 #else
 #define CURL_LIBSSH_VFS_SIZE_MASK PRIu64
 #endif