diff --git a/tests/run-tests-exp.sh b/tests/run-tests-exp.sh
index 5bc84d1e3..8f81b96d2 100755
--- a/tests/run-tests-exp.sh
+++ b/tests/run-tests-exp.sh
@@ -2,7 +2,7 @@
 #
 # This is plain shell variant of run-tests script, which uses .exp files
 # as generated by run-tests --write-exp. It is useful to run testsuite
-# on embedded systems which doesn't have CPython3.
+# on embedded systems which don't have CPython3.
 #
 
 RM="rm -f"