diff --git a/dnssec_generate.py b/dnssec_generate.py
index 663a050..ab5844e 100755
--- a/dnssec_generate.py
+++ b/dnssec_generate.py
@@ -16,7 +16,7 @@ except:
 if __name__ == '__main__':
     ds_records = {}
     for zone in zones:
-        cds = subprocess.check_output(['knotc', 'zone-read', zone, '@', 'CDS'])[:-1].decode('utf-8')
+        cds = subprocess.check_output(['/usr/sbin/knotc', 'zone-read', zone, '@', 'CDS'])[:-1].decode('utf-8')
         ds = {}
         try:
             cds = cds.split(' ')