diff --git a/library/padlock.c b/library/padlock.c
index 2e2e477..a7b4c0c 100644
--- a/library/padlock.c
+++ b/library/padlock.c
@@ -77,9 +77,9 @@
                        unsigned char output[16] )
 {
     int ebx;
-    unsigned long *rk;
-    unsigned long *blk;
-    unsigned long *ctrl;
+    uint32_t *rk;
+    uint32_t *blk;
+    uint32_t *ctrl;
     unsigned char buf[256];
 
     rk  = ctx->rk;
@@ -119,9 +119,9 @@
 {
     int ebx;
     size_t count;
-    unsigned long *rk;
-    unsigned long *iw;
-    unsigned long *ctrl;
+    uint32_t *rk;
+    uint32_t *iw;
+    uint32_t *ctrl;
     unsigned char buf[256];
 
     if( ( (long) input  & 15 ) != 0 ||