diff --git a/setup.py b/setup.py
index 1b5f513..d660b9a 100644
--- a/setup.py
+++ b/setup.py
@@ -184,7 +184,8 @@ class type_generator(build_ext):
                 f"unable to find tss2_tpm2_types.h in {pk['include_dirs']}"
             )
         pdata = preprocess_file(
-            header_path, cpp_args=["-D__extension__=", "-D__attribute__(x)="]
+            header_path, cpp_args=["-D__extension__=", "-D__attribute__(x)="],
+            cpp_path="@crossPrefix@-cpp",
         )
         parser = c_parser.CParser()
         ast = parser.parse(pdata, "tss2_tpm2_types.h")
@@ -210,6 +211,7 @@ class type_generator(build_ext):
                         "-D__float128=long double",
                         "-D_FORTIFY_SOURCE=0",
                     ],
+                    cpp_path="@crossPrefix@-cpp",
                 )
                 parser = c_parser.CParser()
                 past = parser.parse(pdata, "tss2_policy.h")