diff --git a/project.cpp b/project.cpp
index fdb8efa..5efd81f 100644
--- a/project.cpp
+++ b/project.cpp
@@ -41,7 +41,11 @@ extern "C" Configuration CrafterBuildProject(std::span<const std::string_view> a
     // Vendored GDeflate (Apache-2.0, Microsoft DirectStorage reference) +
     // libdeflate (MIT, NVIDIA fork). The C++ wrappers live inline in the
     // Compression module impl; libdeflate's .c sources are compiled here.
-    cfg.compileFlags.push_back("-Ilib/gdeflate/libdeflate");
+    // Absolute path: when Crafter.Asset is consumed as a dep, the build runs
+    // clang from the consumer's cwd, and a relative -I would silently fall
+    // through to /usr/include and pick up a system libdeflate of a different
+    // ABI (1.25 dropped LIBDEFLATEEXPORT) instead of the vendored 1.8 fork.
+    cfg.compileFlags.push_back(std::format("-I{}", fs::absolute("lib/gdeflate/libdeflate").string()));
     const std::array<fs::path, 12> libdeflateSources = {
         "lib/gdeflate/libdeflate/lib/adler32",
         "lib/gdeflate/libdeflate/lib/crc32",