diff --git a/test/test_mangle b/test/test_mangle
index 2d0e382..558baf7 100755
--- a/test/test_mangle
+++ b/test/test_mangle
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. "${1:-./fstab-helpers}"
+. ./fstab-helpers
 . ./test/common
 
 ASSERT_streq ' deleted' "$(unmangle "$(mangle ' deleted')")"
diff --git a/test/test_option_twiddling b/test/test_option_twiddling
index 665fc5d..793e848 100755
--- a/test/test_option_twiddling
+++ b/test/test_option_twiddling
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. "${1:-./fstab-helpers}"
+. ./fstab-helpers
 . ./test/common
 
 optstring=rw,relatime,fd=29,pgrp=1,timeout=300,minproto=5,maxproto=5,direct
diff --git a/test/test_valid_number_of_base b/test/test_valid_number_of_base
index d31c8e4..08e5d5b 100755
--- a/test/test_valid_number_of_base
+++ b/test/test_valid_number_of_base
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. "${1:-./fstab-helpers}"
+. ./fstab-helpers
 . ./test/common
 
 EXPECT_success valid_number_of_base 16 feedfacebeef