diff --git a/ChangeLog.d/psa_util_in_builds_without_psa.txt b/ChangeLog.d/psa_util_in_builds_without_psa.txt
new file mode 100644
index 000000000..7c0866dd3
--- /dev/null
+++ b/ChangeLog.d/psa_util_in_builds_without_psa.txt
@@ -0,0 +1,5 @@
+Bugfix
+   * When MBEDTLS_PSA_CRYPTO_C was disabled and MBEDTLS_ECDSA_C enabled,
+     some code was defining 0-size arrays, resulting in compilation errors.
+     Fixed by disabling the offending code in configurations without PSA
+     Crypto, where it never worked. Fixes #9311.
diff --git a/include/mbedtls/config_adjust_legacy_crypto.h b/include/mbedtls/config_adjust_legacy_crypto.h
index 7a375d864..3ba987ebb 100644
--- a/include/mbedtls/config_adjust_legacy_crypto.h
+++ b/include/mbedtls/config_adjust_legacy_crypto.h
@@ -428,7 +428,7 @@
 
 /* psa_util file features some ECDSA conversion functions, to convert between
  * legacy's ASN.1 DER format and PSA's raw one. */
-#if defined(MBEDTLS_ECDSA_C) || (defined(MBEDTLS_PSA_CRYPTO_C) && \
+#if (defined(MBEDTLS_PSA_CRYPTO_CLIENT) && \
     (defined(PSA_WANT_ALG_ECDSA) || defined(PSA_WANT_ALG_DETERMINISTIC_ECDSA)))
 #define MBEDTLS_PSA_UTIL_HAVE_ECDSA
 #endif