diff --git a/src/ctypesgen/parser/preprocessor.py b/src/ctypesgen/parser/preprocessor.py
index 67bd057..f7f01f8 100755
--- a/src/ctypesgen/parser/preprocessor.py
+++ b/src/ctypesgen/parser/preprocessor.py
@@ -139,7 +139,7 @@ def parse(self, filename):
             cmd,
             universal_newlines=False,  # binary
             stdout=subprocess.PIPE,
-            check=True,
+            check=not IS_WINDOWS,
         )
         
         if IS_MAC: