diff --git a/gebs.h b/gebs.h
index 1ac705b..f6ab0ff 100644
--- a/gebs.h
+++ b/gebs.h
@@ -418,6 +418,7 @@ char *gebs_cwd(void);
 int gebs_cmd_run_sync_alloc(Gebs_Allocator *alloc, Gebs_Cmd *cmd)
 {
     Gebs_String_Builder sb = {0};
+    defer { gebs_sb_free_alloc(alloc, &sb); }
     gebs_nsl_join_alloc(alloc, cmd, &sb, " ");
     gebs_sb_finish_alloc(alloc, &sb);
     GEBS_LOGI("cmd `%s`\n", sb.items);
@@ -462,6 +463,7 @@ int gebs_cmd_run_sync_alloc(Gebs_Allocator *alloc, Gebs_Cmd *cmd)
 int gebs_cmd_run_sync_collect_alloc(Gebs_Allocator *alloc, Gebs_Cmd *cmd, Gebs_String_Builder *sb_out)
 {
     Gebs_String_Builder sb = {0};
+    defer { gebs_sb_free_alloc(alloc, &sb); }
     gebs_nsl_join_alloc(alloc, cmd, &sb, " ");
     gebs_sb_finish_alloc(alloc, &sb);
     GEBS_LOGI("cmd `%s`\n", sb.items);