diff --git a/scripts/coccinelle/uncalloc.cocci b/scripts/coccinelle/uncalloc.cocci
new file mode 100644
index 0000000000..bf3f74165a
--- /dev/null
+++ b/scripts/coccinelle/uncalloc.cocci
@@ -0,0 +1,13 @@
+
+@@
+expression a;
+@@
+- tor_calloc(1, a)
++ tor_malloc_zero(a)
+
+@@
+expression a;
+@@
+- tor_calloc(a, 1)
++ tor_malloc_zero(a)
+