diff --git a/programs/fuzz/fuzz_client.c b/programs/fuzz/fuzz_client.c
index 7ffa7be..270ae8a 100644
--- a/programs/fuzz/fuzz_client.c
+++ b/programs/fuzz/fuzz_client.c
@@ -8,7 +8,9 @@
 #include <stdint.h>
 
 
-#ifdef MBEDTLS_SSL_CLI_C
+#if defined(MBEDTLS_SSL_CLI_C) && \
+    defined(MBEDTLS_ENTROPY_C) && \
+    defined(MBEDTLS_CTR_DRBG_C)
 static int initialized = 0;
 #if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
 static mbedtls_x509_crt cacert;
@@ -25,11 +27,13 @@
 #endif
 
 const char *pers = "fuzz_client";
-#endif //MBEDTLS_SSL_CLI_C
+#endif /* MBEDTLS_SSL_CLI_C && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */
 
 
 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
-#ifdef MBEDTLS_SSL_CLI_C
+#if defined(MBEDTLS_SSL_CLI_C) && \
+    defined(MBEDTLS_ENTROPY_C) && \
+    defined(MBEDTLS_CTR_DRBG_C)
     int ret;
     size_t len;
     mbedtls_ssl_context ssl;
@@ -167,7 +171,7 @@
 #else
     (void) Data;
     (void) Size;
-#endif //MBEDTLS_SSL_CLI_C
+#endif /* MBEDTLS_SSL_CLI_C && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */
 
     return 0;
 }