diff --git a/tools/net/ynl/pyynl/ynl_gen_c.py b/tools/net/ynl/pyynl/ynl_gen_c.py
index c2eabc90dce8c..aa08b8b1463d0 100755
--- a/tools/net/ynl/pyynl/ynl_gen_c.py
+++ b/tools/net/ynl/pyynl/ynl_gen_c.py
@@ -2549,6 +2549,9 @@ def render_uapi(family, cw):
 
     defines = []
     for const in family['definitions']:
+        if const.get('header'):
+            continue
+
         if const['type'] != 'const':
             cw.writes_defines(defines)
             defines = []