diff --git a/tools/blktap2/drivers/check_gcrypt b/tools/blktap2/drivers/check_gcrypt
index 88209a0e76..09d524bbfe 100644
--- a/tools/blktap2/drivers/check_gcrypt
+++ b/tools/blktap2/drivers/check_gcrypt
@@ -4,8 +4,7 @@ cat > .gcrypt.c << EOF
 #include <gcrypt.h>
 int main(void) 
 {
-    char dummy[14];
-    MD5("DUMMY", 5, dummy);
+    gcry_md_hash_buffer(GCRY_MD_MD5, NULL, NULL, 0);
     return 0; 
 }
 EOF