diff --git a/src/fu-engine.c b/src/fu-engine.c
index 8da880ee4..a02d008b8 100644
--- a/src/fu-engine.c
+++ b/src/fu-engine.c
@@ -4373,6 +4373,7 @@ fu_engine_load_plugins (FuEngine *self, GError **error)
 	const gchar *fn;
 	g_autoptr(GDir) dir = NULL;
 	g_autofree gchar *plugin_path = NULL;
+	g_autofree gchar *suffix = g_strdup_printf (".%s", G_MODULE_SUFFIX);
 
 	/* search */
 	plugin_path = fu_common_get_path (FU_PATH_KIND_PLUGINDIR_PKG);
@@ -4386,7 +4387,7 @@ fu_engine_load_plugins (FuEngine *self, GError **error)
 		g_autoptr(GError) error_local = NULL;
 
 		/* ignore non-plugins */
-		if (!g_str_has_suffix (fn, ".so"))
+		if (!g_str_has_suffix (fn, suffix))
 			continue;
 
 		/* is blacklisted */
diff --git a/src/fu-self-test.c b/src/fu-self-test.c
index 491acf4c9..0d927c8bc 100644
--- a/src/fu-self-test.c
+++ b/src/fu-self-test.c
@@ -1192,7 +1192,7 @@ fu_engine_history_func (void)
 	fu_engine_set_silo (engine, silo_empty);
 
 	/* set up dummy plugin */
-	ret = fu_plugin_open (plugin, PLUGINBUILDDIR "/libfu_plugin_test.so", &error);
+	ret = fu_plugin_open (plugin, PLUGINBUILDDIR "/libfu_plugin_test." G_MODULE_SUFFIX, &error);
 	g_assert_no_error (error);
 	g_assert (ret);
 	fu_engine_add_plugin (engine, plugin);
@@ -1322,7 +1322,7 @@ fu_engine_history_inherit (void)
 
 	/* set up dummy plugin */
 	g_setenv ("FWUPD_PLUGIN_TEST", "fail", TRUE);
-	ret = fu_plugin_open (plugin, PLUGINBUILDDIR "/libfu_plugin_test.so", &error);
+	ret = fu_plugin_open (plugin, PLUGINBUILDDIR "/libfu_plugin_test." G_MODULE_SUFFIX, &error);
 	g_assert_no_error (error);
 	g_assert (ret);
 	fu_engine_add_plugin (engine, plugin);
@@ -1432,7 +1432,7 @@ fu_engine_history_error_func (void)
 
 	/* set up dummy plugin */
 	g_setenv ("FWUPD_PLUGIN_TEST", "fail", TRUE);
-	ret = fu_plugin_open (plugin, PLUGINBUILDDIR "/libfu_plugin_test.so", &error);
+	ret = fu_plugin_open (plugin, PLUGINBUILDDIR "/libfu_plugin_test." G_MODULE_SUFFIX, &error);
 	g_assert_no_error (error);
 	g_assert (ret);
 	fu_engine_add_plugin (engine, plugin);
@@ -2271,7 +2271,7 @@ fu_plugin_hash_func (void)
 
 	/* create a tainted plugin */
 	g_setenv ("FWUPD_PLUGIN_TEST", "build-hash", TRUE);
-	ret = fu_plugin_open (plugin, PLUGINBUILDDIR "/libfu_plugin_test.so", &error);
+	ret = fu_plugin_open (plugin, PLUGINBUILDDIR "/libfu_plugin_test." G_MODULE_SUFFIX, &error);
 	g_assert_no_error (error);
 
 	/* make sure it tainted now */
@@ -2304,7 +2304,7 @@ fu_plugin_module_func (void)
 	/* create a fake device */
 	plugin = fu_plugin_new ();
 	g_setenv ("FWUPD_PLUGIN_TEST", "registration", TRUE);
-	ret = fu_plugin_open (plugin, PLUGINBUILDDIR "/libfu_plugin_test.so", &error);
+	ret = fu_plugin_open (plugin, PLUGINBUILDDIR "/libfu_plugin_test." G_MODULE_SUFFIX, &error);
 	g_assert_no_error (error);
 	g_assert (ret);
 	ret = fu_plugin_runner_startup (plugin, &error);
@@ -3141,7 +3141,7 @@ fu_plugin_composite_func (void)
 
 	/* set up dummy plugin */
 	g_setenv ("FWUPD_PLUGIN_TEST", "composite", TRUE);
-	ret = fu_plugin_open (plugin, PLUGINBUILDDIR "/libfu_plugin_test.so", &error);
+	ret = fu_plugin_open (plugin, PLUGINBUILDDIR "/libfu_plugin_test." G_MODULE_SUFFIX, &error);
 	g_assert_no_error (error);
 	g_assert_true (ret);
 	fu_engine_add_plugin (engine, plugin);