diff --git a/Makefile.in b/Makefile.in
index fa7968aeb..2a0cc8f41 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -342,7 +342,7 @@ test_test_deps = test_low_level $(test_high_level_test_deps)
 test_high_level_test_deps = test_fishscript test_interactive
 
 active_test_goals = $(filter $(test_goals),$(foreach a,$(or $(MAKECMDGOALS),$(.DEFAULT_GOAL)),$(a) $($(a)_test_deps)))
-filter_up_to = $(eval b:=1)$(foreach a,$(2),$(and $(bo),$(if $(subst $(1),,$(a)),$(a),$(eval b:=))))
+filter_up_to = $(eval b:=1)$(foreach a,$(2),$(and $(b),$(if $(subst $(1),,$(a)),$(a),$(eval b:=))))
 
 # The values for XDG_DATA_HOME and XDG_CONFIG_HOME mimic those from tests/test_util.fish.
 test_low_level: fish_tests $(call filter_up_to,test_low_level,$(active_test_goals))