1 files changed, 1 insertions, 1 deletions

diff --git a/src/microhttpd/test_upgrade.c b/src/microhttpd/test_upgrade.c
index 81a36004..d2e0e536 100644
--- a/src/microhttpd/test_upgrade.c
+++ b/src/microhttpd/test_upgrade.c
@@ -572,7 +572,7 @@ static pthread_t pt;
 /**
  * Will be set to the upgraded socket.
  */
-static struct wr_socket *usock;
+static struct wr_socket *volatile usock;
 
 /**
  * Thread we use to run the interaction with the upgraded socket.