diff --git a/src/rand.c b/src/rand.c
index aaf489ec..239700a5 100644
--- a/src/rand.c
+++ b/src/rand.c
@@ -64,6 +64,14 @@
 #include <nss/pk11pub.h>
 #endif
 #endif
+#ifndef USE_LIB_CRYPTO
+#undef USE_NETTLE_CRYPTO
+#undef USE_MBEDTLS_CRYPTO
+#undef USE_WOLFSSL_CRYPTO
+#undef USE_OPENSSL_CRYPTO
+#undef USE_GNUTLS_CRYPTO
+#undef USE_NSS_CRYPTO
+#endif
 #ifdef HAVE_GETENTROPY
 #include <sys/random.h>
 #endif
diff --git a/src/sys-crypto.h b/src/sys-crypto.h
index fb60e4d3..aad3d0f3 100644
--- a/src/sys-crypto.h
+++ b/src/sys-crypto.h
@@ -50,4 +50,8 @@
 #define USE_GNUTLS_CRYPTO
 #endif
 
+#ifdef WITHOUT_LIB_CRYPTO
+#undef USE_LIB_CRYPTO
+#endif
+
 #endif