diff --git a/src/lookup3.h b/src/lookup3.h
index 7202b21..9b39aa1 100644
--- a/src/lookup3.h
+++ b/src/lookup3.h
@@ -73,7 +73,7 @@ on 1 byte), but shoehorning those bytes into integers efficiently is messy.
 # define HASH_BIG_ENDIAN 0
 #endif
 
-#define hashsize(n) ((uint32_t)1<<(n))
+#define hashsize(n) ((size_t)1<<(n))
 #define hashmask(n) (hashsize(n)-1)
 #define rot(x,k) (((x)<<(k)) | ((x)>>(32-(k))))