diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 10085ffda6..a89e4859d3 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -122,6 +122,8 @@ jobs:
           cargo +${{ matrix.rust-toolchain }} build $BUILD_TYPE --bin neqo-client --bin neqo-server
           "target/$BUILD_DIR/neqo-server" "$HOST:4433" &
           PID=$!
+          # Give the server time to start.
+          sleep 1
           "target/$BUILD_DIR/neqo-client" --output-dir . "https://$HOST:4433/$SIZE"
           kill $PID
           [ "$(wc -c <"$SIZE")" -eq "$SIZE" ] || exit 1