diff --git a/pyexternals/CMakeLists.txt b/pyexternals/CMakeLists.txt
index d682ad4b0d5f2b52b1e221cfc9f8c0bc99d99481..2cde54d6f1cc3168475fac2657fd360b677e3543 100644
--- a/pyexternals/CMakeLists.txt
+++ b/pyexternals/CMakeLists.txt
@@ -3613,7 +3613,7 @@ LCGPackage_Add(
   INSTALL_COMMAND ${MakeSitePackagesDir}
           COMMAND ${PYTHON} ${pip_home}/bin/pip install ${PySetupOptions} ${GenURL}/tensorboard_plugin_wit-${tensorboard_plugin_wit_native_version}-${py_tensorflow}-none-any.whl
           COMMAND ${CMAKE_SOURCE_DIR}/pyexternals/Python_postinstall.sh <INSTALL_DIR>
-  DEPENDS Python setuptools pip wheel
+  DEPENDS Python setuptools pip wheel numpy
 )