diff --git a/meson.build b/meson.build
index b70ec5d..be9c365 100644
--- a/meson.build
+++ b/meson.build
@@ -49,6 +49,7 @@ libglib_testing_dep = dependency(
 config_h = configuration_data()
 config_h.set_quoted('GETTEXT_PACKAGE', 'malcontent')
 config_h.set_quoted('PACKAGE_LOCALE_DIR', join_paths(get_option('prefix'), get_option('localedir')))
+config_h.set_quoted('PAMLIBDIR', pamlibdir)
 config_h.set_quoted('VERSION', meson.project_version())
 configure_file(
   output: 'config.h',
diff --git a/pam/tests/pam_malcontent.c b/pam/tests/pam_malcontent.c
index 871516b..8aebb3d 100644
--- a/pam/tests/pam_malcontent.c
+++ b/pam/tests/pam_malcontent.c
@@ -24,6 +24,7 @@
 #include <glib.h>
 #include <locale.h>
 #include <stdlib.h>
+#include "config.h"
 
 /* Test that the `pam_malcontent.so` module can be loaded using dlopen() and
  * that it exports the appropriate symbols for PAM to be able to use it. */
@@ -37,6 +38,13 @@ test_pam_malcontent_dlopen (void)
 
   module_path = g_test_build_filename (G_TEST_BUILT, "..", "pam_malcontent.so", NULL);
 
+  /* Installed tests version. */
+  if (!g_file_test (module_path, G_FILE_TEST_EXISTS))
+    {
+      g_free (module_path);
+      module_path = g_build_filename (PAMLIBDIR, "pam_malcontent.so", NULL);
+    }
+
   /* Check the module can be loaded. */
   handle = dlopen (module_path, RTLD_NOW);
   g_assert_nonnull (handle);