diff --git a/puer.c b/puer.c
index 47e1d0b..839b9f7 100644
--- a/puer.c
+++ b/puer.c
@@ -13,7 +13,7 @@
 // Adjusting this will render the file format incompatible
 // KDF_WORKFACTOR must be a power of two between 1 and 2^32
 #define KDF_BLOCKSIZE 1024
-#define KDF_WORKFACTOR (64 * 1024)
+#define KDF_WORKFACTOR (16 * 1024)
 unsigned char workbuf[KDF_WORKFACTOR * KDF_BLOCKSIZE];
 
 void xxtea128(uint32_t const key[4], uint32_t block[4]) {