diff --git a/boot/bootutil/include/bootutil/crypto/aes_ctr.h b/boot/bootutil/include/bootutil/crypto/aes_ctr.h
index e69b0372..50d36a4f 100644
--- a/boot/bootutil/include/bootutil/crypto/aes_ctr.h
+++ b/boot/bootutil/include/bootutil/crypto/aes_ctr.h
@@ -53,9 +53,7 @@ static inline void bootutil_aes_ctr_init(bootutil_aes_ctr_context *ctx)
 
 static inline void bootutil_aes_ctr_drop(bootutil_aes_ctr_context *ctx)
 {
-    /* XXX: config defines MBEDTLS_PLATFORM_NO_STD_FUNCTIONS so no need to free */
-    /* (void)mbedtls_aes_free(ctx); */
-    (void)ctx;
+    mbedtls_aes_free(ctx);
 }
 
 static inline int bootutil_aes_ctr_set_key(bootutil_aes_ctr_context *ctx, const uint8_t *k)
diff --git a/boot/bootutil/include/bootutil/crypto/aes_kw.h b/boot/bootutil/include/bootutil/crypto/aes_kw.h
index cf3194f9..34045c2d 100644
--- a/boot/bootutil/include/bootutil/crypto/aes_kw.h
+++ b/boot/bootutil/include/bootutil/crypto/aes_kw.h
@@ -45,9 +45,7 @@ static inline void bootutil_aes_kw_init(bootutil_aes_kw_context *ctx)
 
 static inline void bootutil_aes_kw_drop(bootutil_aes_kw_context *ctx)
 {
-    /* XXX: config defines MBEDTLS_PLATFORM_NO_STD_FUNCTIONS so no need to free */
-    /* (void)mbedtls_aes_free(ctx); */
-    (void)ctx;
+    mbedtls_nist_kw_free(ctx);
 }
 
 static inline int bootutil_aes_kw_set_unwrap_key(bootutil_aes_kw_context *ctx, const uint8_t *k, uint32_t klen)
diff --git a/boot/bootutil/include/bootutil/crypto/sha.h b/boot/bootutil/include/bootutil/crypto/sha.h
index 9ce54bee..704a123e 100644
--- a/boot/bootutil/include/bootutil/crypto/sha.h
+++ b/boot/bootutil/include/bootutil/crypto/sha.h
@@ -126,9 +126,7 @@ static inline int bootutil_sha_init(bootutil_sha_context *ctx)
 
 static inline int bootutil_sha_drop(bootutil_sha_context *ctx)
 {
-    /* XXX: config defines MBEDTLS_PLATFORM_NO_STD_FUNCTIONS so no need to free */
-    /* (void)mbedtls_sha256_free(ctx); */
-    (void)ctx;
+    mbedtls_sha256_free(ctx);
     return 0;
 }