diff --git a/QPALM/interfaces/python/cmake/Pybind11Stubgen.cmake b/QPALM/interfaces/python/cmake/Pybind11Stubgen.cmake
index 245764cb..818b030a 100644
--- a/QPALM/interfaces/python/cmake/Pybind11Stubgen.cmake
+++ b/QPALM/interfaces/python/cmake/Pybind11Stubgen.cmake
@@ -9,7 +9,7 @@ function(pybind11_stubgen target)
                 ${PY_BUILD_CMAKE_MODULE_NAME}.$<TARGET_FILE_BASE_NAME:${target}>
                 --numpy-array-remove-parameters
                 --ignore-invalid-expressions \\\\?
-                --ignore-unresolved-names m\\|n
+                --ignore-unresolved-names 'm|n'
                 --exit-code
                 -o ${CMAKE_CURRENT_BINARY_DIR}/stubs/$<TARGET_FILE_BASE_NAME:${target}>
         WORKING_DIRECTORY $<TARGET_FILE_DIR:${target}>/..