diff --git a/include/z64actor.h b/include/z64actor.h
index 1e81bab9b7..785cec9cde 100644
--- a/include/z64actor.h
+++ b/include/z64actor.h
@@ -748,6 +748,10 @@ typedef struct NpcInteractInfo {
 #define PARAMS_GET_NOSHIFT(p, s, n) \
     ((p) & (NBITS_TO_MASK(n) << (s)))
 
+// Moves the `n`-bit value `p` to bit position `s` for building actor parameters by OR-ing these together
+#define PARAMS_PACK(p, s, n) \
+    (((p) & NBITS_TO_MASK(n)) << (s))
+
 // Generates a bitmask for bit position `s` of length `n`
 #define PARAMS_MAKE_MASK(s, n) PARAMS_GET_NOSHIFT(~0, s, n)