diff --git a/lib/md4.c b/lib/md4.c
index 318e9da6ae..d575d81d2b 100644
--- a/lib/md4.c
+++ b/lib/md4.c
@@ -24,7 +24,7 @@
 
 #include "curl_setup.h"
 
-#if !defined(CURL_DISABLE_CRYPTO_AUTH)
+#if defined(USE_CURL_NTLM_CORE)
 
 #include <string.h>
 
@@ -504,4 +504,4 @@ void Curl_md4it(unsigned char *output, const unsigned char *input,
   MD4_Final(output, &ctx);
 }
 
-#endif /* CURL_DISABLE_CRYPTO_AUTH */
+#endif /* USE_CURL_NTLM_CORE */
diff --git a/tests/unit/unit1611.c b/tests/unit/unit1611.c
index 16634234de..0062ac6c37 100644
--- a/tests/unit/unit1611.c
+++ b/tests/unit/unit1611.c
@@ -37,7 +37,7 @@ static void unit_stop(void)
 
 UNITTEST_START
 
-#ifndef CURL_DISABLE_CRYPTO_AUTH
+#ifdef USE_CURL_NTLM_CORE
   const char string1[] = "1";
   const char string2[] = "hello-you-fool";
   unsigned char output[MD4_DIGEST_LENGTH];