diff --git a/tests/31plugin.tests b/tests/31plugin.tests
index 15f7e7a90..46844f754 100644
--- a/tests/31plugin.tests
+++ b/tests/31plugin.tests
@@ -10,7 +10,7 @@ export LUMIERA_PLUGIN_PATH=.libs
 export LUMIERA_CONFIG_PATH=./
 
 TEST "discovering plugins" plugin_discover <<END
-out: found plugin: .libs/examplepluginc.so
+out: found plugin: .libs/examplepluginc.lum
 return: 0
 END
 
diff --git a/tests/common/test-interfaces.c b/tests/common/test-interfaces.c
index d11214af3..217459851 100644
--- a/tests/common/test-interfaces.c
+++ b/tests/common/test-interfaces.c
@@ -465,7 +465,7 @@ TEST ("plugin_discover")
 
   if (lumiera_plugin_discover (lumiera_plugin_load, lumiera_plugin_register))
     {
-      LumieraPlugin p = lumiera_plugin_lookup (".libs/examplepluginc.so");
+      LumieraPlugin p = lumiera_plugin_lookup (".libs/examplepluginc.lum");
       printf ("found plugin: %s\n", lumiera_plugin_name (p));
       lumiera_plugin_discover (lumiera_plugin_load, lumiera_plugin_register);
     }