diff --git a/python/obitools3/commands/grep.pyx b/python/obitools3/commands/grep.pyx
index 9e65efe..e41867a 100755
--- a/python/obitools3/commands/grep.pyx
+++ b/python/obitools3/commands/grep.pyx
@@ -143,8 +143,8 @@ def Filter_generator(options, tax_filter):
     
     # Initialize conditions
     predicates = None
-    if "predicates" in options:
-        predicates = options["predicates"]
+    if "grep_predicates" in options:
+        predicates = options["grep_predicates"]
     attributes = None
     if "attributes" in options:
         attributes = options["attributes"]