diff --git a/include/mbedtls/config_psa.h b/include/mbedtls/config_psa.h
index 7718f8547052..2f78d3fbf688 100644
--- a/include/mbedtls/config_psa.h
+++ b/include/mbedtls/config_psa.h
@@ -436,6 +436,7 @@ extern "C" {
 #if !defined(MBEDTLS_PSA_ACCEL_ALG_CHACHA20_POLY1305)
 #if defined(PSA_WANT_KEY_TYPE_CHACHA20)
 #define MBEDTLS_CHACHAPOLY_C
+#define MBEDTLS_POLY1305_C
 #define MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 1
 #endif /* PSA_WANT_KEY_TYPE_CHACHA20 */
 #endif /* !MBEDTLS_PSA_ACCEL_ALG_CHACHA20_POLY1305 */