diff --git a/test.py b/test.py
index 1a7883d..ed7b041 100755
--- a/test.py
+++ b/test.py
@@ -75,6 +75,15 @@
     librariespath = os.path.normpath(os.path.join(os.environ.get('APPDATA'), '.openmodelica', 'libraries'))
   else:
     librariespath = os.path.normpath(os.path.join(os.environ.get('HOME'), '.openmodelica', 'libraries'))
+
+# add openmodelica libraries path if the Modelica libraries are not found in the libraries path
+modelicaLibpath = ''
+if len(glob.glob('Modelica*', root_dir=librariespath)) == 0:
+  if isWin:
+    modelicaLibpath = ';' + os.path.normpath(os.path.join(os.environ.get('APPDATA'), '.openmodelica', 'libraries')).replace('\\','/')
+  else:
+    modelicaLibpath = ':' + os.path.normpath(os.path.join(os.environ.get('APPDATA'), '.openmodelica', 'libraries')).replace('\\','/')
+
 overrideDefaults = [arg.split("=", 1) for arg in args.default]
 execAllTests = args.execAllTests
 msysEnvironment = args.msysEnvironment
@@ -256,7 +265,7 @@ def timeSeconds(f):
   return html.escape("%.2f" % f)
 
 if not docker:
-  omc.sendExpression('setModelicaPath("%s")' % librariespath.replace('\\','/'))
+  omc.sendExpression('setModelicaPath("%s")' % (librariespath.replace('\\','/') + modelicaLibpath,))
 omc_exe=os.path.normpath(os.path.join(omhome,"bin","omc"))
 dygraphs=os.path.normpath(os.path.join(ompython_omhome or omhome,"share","doc","omc","testmodels","dygraph-combined.js"))
 print(omc_exe,omc_version,dygraphs)
diff --git a/testmodel.py b/testmodel.py
index a09bc0c..8be64cc 100755
--- a/testmodel.py
+++ b/testmodel.py
@@ -6,7 +6,7 @@
 import simplejson as json
 from monotonic import monotonic
 from OMPython import FindBestOMCSession, OMCSession, OMCSessionZMQ
-import shared
+import shared, glob
 
 parser = argparse.ArgumentParser(description='OpenModelica library testing tool helper (single model)')
 parser.add_argument('config')
@@ -28,6 +28,14 @@
 isWin = args.win
 msysEnvironment = args.msysEnvironment
 
+# add openmodelica libraries path if the Modelica libraries are not found in the libraries path
+modelicaLibpath = ''
+if len(glob.glob('Modelica*', root_dir=libraries)) == 0:
+  if isWin:
+    modelicaLibpath = ';' + os.path.normpath(os.path.join(os.environ.get('APPDATA'), '.openmodelica', 'libraries')).replace('\\','/')
+  else:
+    modelicaLibpath = ':' + os.path.normpath(os.path.join(os.environ.get('APPDATA'), '.openmodelica', 'libraries')).replace('\\','/')
+
 try:
   os.mkdir("files")
 except OSError:
@@ -260,7 +268,7 @@ def createOmcSessionNew():
   cflags += " " + conf["optlevel"]
   omc.sendExpression(str("setCFlags(\"%s\")" % cflags), parsed = False)
 
-omc.sendExpression('setModelicaPath("%s")' % libraries, parsed = False)
+omc.sendExpression('setModelicaPath("%s")' % (libraries+modelicaLibpath,), parsed = False)
 
 if conf.get("ulimitMemory"):
   # Use at most 80% of the vmem for the GC heap; some memory will be used for other purposes than the GC itself
@@ -284,7 +292,7 @@ def loadLibraryInNewOM():
     newOMLoaded = True
     # Broken/old getSimulationOptions; use new one (requires parsing again)
     assert(ompython_omhome!="")
-    assert(omc_new.sendExpression('setModelicaPath("%s")' % libraries))
+    assert(omc_new.sendExpression('setModelicaPath("%s")' % (libraries+modelicaLibpath,)))
     loadModels(omc_new, conf)
 
 start=monotonic()