diff --git a/Makefile.am b/Makefile.am
index 6751f4613..796255b5f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -213,6 +213,7 @@ TESTS_ENVIRONMENT = \
 	abs_top_srcdir=$(abs_top_srcdir) \
 	objdir=$(abs_top_builddir) \
 	GNUPG_BUILD_ROOT="$(abs_top_builddir)" \
+	GNUPG_IN_TEST_SUITE=fact \
 	GPGSCM_PATH=$(abs_top_srcdir)/tests/gpgscm
 
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