diff --git a/c_gen/loxi_utils_legacy.py b/c_gen/loxi_utils_legacy.py
index 2e3347b..df93c2b 100644
--- a/c_gen/loxi_utils_legacy.py
+++ b/c_gen/loxi_utils_legacy.py
@@ -191,7 +191,7 @@
 
     # For each vendor, check for vendor specific action
     for exp in of_g.experimenter_name_to_id:
-        if cls.find("of_instruction_" + exp) == 0:
+        if cls.find("of_instruction" + exp) == 0:
             return True
 
     return False