diff --git a/Makefile b/Makefile
index 1b7b512..31f5e3a 100644
--- a/Makefile
+++ b/Makefile
@@ -12,7 +12,7 @@ build:
 	@echo Nothing to do: filter-repo is a script which needs no compilation.
 
 test:
-	cd t && time ./run_coverage
+	time t/run_coverage
 
 # fixup_locale might matter once we actually have translations, but right now
 # we don't.  It might not even matter then, because python has a fallback podir.
diff --git a/t/run_coverage b/t/run_coverage
index f72cdd5..2164cc9 100755
--- a/t/run_coverage
+++ b/t/run_coverage
@@ -16,12 +16,8 @@ EOF
 
 export COVERAGE_PROCESS_START=$tmpdir/.coveragerc
 export PYTHONPATH=$tmpdir:
-# We pretend filenames are unicode for two reasons: (1) because it exercises
-# more code, and (2) this setting will detect accidental use of unicode strings
-# for file/directory names when it should always be bytestrings.
-export PRETEND_UNICODE_ARGS=1
 
-ls t939*.sh | xargs -n 1 bash
+$orig_dir/run_tests
 
 cd $tmpdir
 coverage3 combine
diff --git a/t/run_tests b/t/run_tests
new file mode 100755
index 0000000..320188a
--- /dev/null
+++ b/t/run_tests
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+cd $(dirname $0)
+
+# We pretend filenames are unicode for two reasons: (1) because it exercises
+# more code, and (2) this setting will detect accidental use of unicode strings
+# for file/directory names when it should always be bytestrings.
+export PRETEND_UNICODE_ARGS=1
+
+ls t939*.sh | xargs -n 1 bash