diff --git a/tests/checks/job-control-noninteractive.fish b/tests/checks/job-control-noninteractive.fish
index dc166335d..6c9566456 100644
--- a/tests/checks/job-control-noninteractive.fish
+++ b/tests/checks/job-control-noninteractive.fish
@@ -1,4 +1,4 @@
-#RUN: env fth=%fish_test_helper %fish %s
+#RUN: env fth=%fish_test_helper fish=%fish %fish %s
 
 # Ensure job control works in non-interactive environments.
 
diff --git a/tests/checks/pipeline-pgroup.fish b/tests/checks/pipeline-pgroup.fish
index 24eb78e9d..07da18829 100644
--- a/tests/checks/pipeline-pgroup.fish
+++ b/tests/checks/pipeline-pgroup.fish
@@ -1,4 +1,4 @@
-# RUN: env fth=%fish_test_helper %fish %s
+# RUN: env fth=%fish_test_helper fish=%fish %fish %s
 
 status job-control full
 
diff --git a/tests/checks/sigint.fish b/tests/checks/sigint.fish
index 483cccf92..88ffc3247 100644
--- a/tests/checks/sigint.fish
+++ b/tests/checks/sigint.fish
@@ -1,4 +1,4 @@
-#RUN: %fish -C "set helper %fish_test_helper" %s
+#RUN: %fish -C "set -g helper %fish_test_helper; set -g fish %fish" %s
 
 # Check that nohup is propagated.
 set fish (status fish-path)