diff --git a/include/mbedtls/x509_crt.h b/include/mbedtls/x509_crt.h
index 937dcd4..302dd2b 100644
--- a/include/mbedtls/x509_crt.h
+++ b/include/mbedtls/x509_crt.h
@@ -642,7 +642,7 @@
 }
 #endif
 
-#ifndef MBEDTLS_TLS_DEFAULT_ALLOW_SHA1
+#ifndef MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_CERTIFICATES
 /* The test infrastructure requires a positive define */
 #define MBEDTLS_X509__DEFAULT_FORBID_SHA1
 #endif