diff --git a/misc/ninja_syntax.py b/misc/ninja_syntax.py
index ab5c0d4..ca73b5b 100644
--- a/misc/ninja_syntax.py
+++ b/misc/ninja_syntax.py
@@ -74,7 +74,7 @@
             self.variable('deps', deps, indent=1)
 
     def build(self, outputs, rule, inputs=None, implicit=None, order_only=None,
-              variables=None, implicit_outputs=None, pool=None):
+              variables=None, implicit_outputs=None, pool=None, dyndep=None):
         outputs = as_list(outputs)
         out_outputs = [escape_path(x) for x in outputs]
         all_inputs = [escape_path(x) for x in as_list(inputs)]
@@ -97,6 +97,8 @@
                                      ' '.join([rule] + all_inputs)))
         if pool is not None:
             self._line('  pool = %s' % pool)
+        if dyndep is not None:
+            self._line('  dyndep = %s' % dyndep)
 
         if variables:
             if isinstance(variables, dict):