diff --git a/docs/reference.md b/docs/reference.md
index 4cced58..80151ba 100644
--- a/docs/reference.md
+++ b/docs/reference.md
@@ -1464,7 +1464,7 @@
     args = [
       "{{source}}",
       "-o",
-      rebase_path(relative_target_gen_dir, root_build_dir) +
+      rebase_path(target_gen_dir, root_build_dir) +
         "/{{source_name_part}}.h" ]
   }
 ```
diff --git a/src/gn/functions_target.cc b/src/gn/functions_target.cc
index f74cfa6..7693369 100644
--- a/src/gn/functions_target.cc
+++ b/src/gn/functions_target.cc
@@ -256,7 +256,7 @@
     args = [
       "{{source}}",
       "-o",
-      rebase_path(relative_target_gen_dir, root_build_dir) +
+      rebase_path(target_gen_dir, root_build_dir) +
         "/{{source_name_part}}.h" ]
   }
 )";