diff --git a/.github/configs/os-check-linux.json b/.github/configs/os-check-linux.json
index 23dfc3a4e2..35f4d15510 100644
--- a/.github/configs/os-check-linux.json
+++ b/.github/configs/os-check-linux.json
@@ -16,6 +16,9 @@
  "configure": ["--enable-all", "--enable-asn=original"]},
 {"name": "all-certgencache", "minutes": 8.3,
  "configure": ["--enable-all", "--enable-certgencache"]},
+{"name": "all-certsigncb", "minutes": 8.3,
+ "comment": "Only --enable-certsigncb sets WOLFSSL_CERT_SIGN_CB, so without this entry wc_SignCert_cb() and its test are never compiled anywhere in CI. Minutes is seeded from the sibling --enable-all entries; refresh from a run's step summary.",
+ "configure": ["--enable-all", "--enable-certsigncb"]},
 {"name": "all-dtls13-frag-ch-no-mlkem", "minutes": 8.2,
  "configure": ["--enable-all", "--enable-dtls13", "--enable-dtls-frag-ch",
   "--disable-mlkem"]},