diff --git a/modules/mbedtls/configs/config-tls-generic.h b/modules/mbedtls/configs/config-tls-generic.h
index aff59f9e17e763..ddf7b3dddb3885 100644
--- a/modules/mbedtls/configs/config-tls-generic.h
+++ b/modules/mbedtls/configs/config-tls-generic.h
@@ -19,6 +19,14 @@
 #define MBEDTLS_PLATFORM_EXIT_ALT
 #define MBEDTLS_NO_PLATFORM_ENTROPY
 
+#if defined(CONFIG_MBEDTLS_ENABLE_HEAP)
+/* Ensure that we're not using standard [m|c]alloc/free functions.
+ * mbedtls_memory_buffer_alloc_init() will set a local buffer to be used as
+ * heap and Mbed TLS will use internal function over it.
+ */
+#define MBEDTLS_PLATFORM_NO_STD_FUNCTIONS
+#endif
+
 #if defined(CONFIG_MBEDTLS_ZEROIZE_ALT)
 #define MBEDTLS_PLATFORM_ZEROIZE_ALT
 #endif