diff --git a/library/x509write_csr.c b/library/x509write_csr.c
index d792d34..b67cdde 100644
--- a/library/x509write_csr.c
+++ b/library/x509write_csr.c
@@ -35,7 +35,7 @@
 
 #if defined(MBEDTLS_USE_PSA_CRYPTO)
 #include "psa/crypto.h"
-#include "mbedtls/psa_util.h"
+#include "psa_util_internal.h"
 #include "md_psa.h"
 #endif /* MBEDTLS_USE_PSA_CRYPTO */