diff --git a/src/core/runner.c b/src/core/runner.c
index 34ac6ce..1aae935 100644
--- a/src/core/runner.c
+++ b/src/core/runner.c
@@ -361,6 +361,8 @@ void criterion_finalize(struct criterion_test_set *set) {
 #ifndef ENABLE_VALGRIND_ERRORS
     VALGRIND_ENABLE_ERROR_REPORTING;
 #endif
+
+    criterion_free_output();
 }
 
 static void run_tests_async(struct criterion_test_set *set,
diff --git a/src/log/output.c b/src/log/output.c
index b7893ff..b5ce1fb 100644
--- a/src/log/output.c
+++ b/src/log/output.c
@@ -44,6 +44,13 @@ int criterion_add_output(const char *provider, const char *path) {
 }
 
 void criterion_free_output(void) {
+    for (khint_t k = kh_begin(outputs); k != kh_end(outputs); ++k) {
+        if (!kh_exist(outputs, k))
+            continue;
+        str_vec *vec = kh_value(outputs, k);
+        kv_destroy(*vec);
+        free(vec);
+    }
     kh_destroy(ht_str, reporters);
     kh_destroy(ht_path, outputs);
 }