diff --git a/manifold/CMakeLists.txt b/manifold/CMakeLists.txt
index 38c3b8a8..499bb527 100644
--- a/manifold/CMakeLists.txt
+++ b/manifold/CMakeLists.txt
@@ -34,6 +34,7 @@ if (ENABLE_MANIFOLD)
     $<$<BOOL:${ZLIB_TARGET}>:-DZ_PREFIX=ON>
     $<$<BOOL:${ZLIB_TARGET}>:-DZ_PREFIX_STR=${Z_PREFIX_STR}>
     -DASSETIMPORT_ROOT=$<$<BOOL:${ASSETIMPORT_TARGET}>:${CMAKE_BUNDLE_INSTALL_PREFIX}>
+    -DMANIFOLD_EXPORT=ON
     -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
     -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
     -DCMAKE_INSTALL_PREFIX=${CMAKE_BUNDLE_INSTALL_PREFIX}