diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 6a01695..d7f4b71 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -6365,11 +6365,12 @@
             0 \
             -s "Read from client: 100 bytes read$"
 
+requires_max_content_len 474
 run_test    "mbedtls_ssl_get_bytes_avail: extra data" \
             "$P_SRV" \
-            "$P_CLI request_size=500" \
+            "$P_CLI request_size=450" \
             0 \
-            -s "Read from client: 500 bytes read (.*+.*)"
+            -s "Read from client: 450 bytes read (.*+.*)"
 
 # Tests for small client packets