diff --git a/programs/ssl/dtls_server.c b/programs/ssl/dtls_server.c
index 631cfcd..568ef1f 100644
--- a/programs/ssl/dtls_server.c
+++ b/programs/ssl/dtls_server.c
@@ -404,6 +404,7 @@
 #endif
     mbedtls_ctr_drbg_free(&ctr_drbg);
     mbedtls_entropy_free(&entropy);
+    mbedtls_psa_crypto_free();
 
 #if defined(_WIN32)
     printf("  Press Enter to exit this program.\n");