diff --git a/Makefile.am b/Makefile.am
index 6a3f0f7896df9c3d7d89f8024fa46fb9a520e708..3249569efefb6c8f71fa54c88c9c4cdf67fbc99a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -201,7 +201,7 @@ failure_test_cases = \
 $(failure_test_cases):
 	@$(TEST_BIN) -F $(top_srcdir)/$@
 
-TEST_EXTPROGRAMS_BIN = $(TEST_BIN) \
+TEST_EXTPROGRAMS_BIN = NOCHILDREN=yes $(TEST_BIN) \
 	-P src/plugins/sieve-extprograms/.libs/sieve_extprograms
 
 extprograms_test_cases = \