diff --git a/python/gui.py b/python/gui.py
index 19e7e897..9aab6cc4 100644
--- a/python/gui.py
+++ b/python/gui.py
@@ -2,6 +2,9 @@ import netgen
 
 def StartGUI():
     from tkinter import Tk
+    from netgen import config
+    import sys, os
+
     try:
         # the GUI tries to load ngsolve.tcl (which loads ngsolve shared libraries)
         # BUT might fail to load dependencies (like mkl), these are handled by the
@@ -16,6 +19,12 @@ def StartGUI():
     win.tk.eval('lappend ::auto_path ' + netgen._netgen_bin_dir)
     # load with absolute path to avoid issues on MacOS
     win.tk.eval('load "'+netgen._netgen_lib_dir.replace('\\','/')+'/libgui[info sharedlibextension]" gui')
+
+    if config.is_python_package and 'darwin' in sys.platform:
+        # libngsolve and other libraries are installed into netgen python dir to keep relative installation paths, but tcl won't find them there automatically
+        netgen_dir = os.path.abspath(os.path.dirname(netgen.__file__))
+        win.tk.eval(f'set netgen_library_dir {netgen_dir}')
+
     win.tk.eval( netgen.libngpy._meshing._ngscript)