diff --git a/src/chgrp.c b/src/chgrp.c
index cab49b8..56d37f7 100644
--- a/src/chgrp.c
+++ b/src/chgrp.c
@@ -33,12 +33,12 @@
 
 /* chgrp */
 /* types */
-typedef int Prefs;
-#define CHGRP_PREFS_h 1
-#define CHGRP_PREFS_R 2
-#define CHGRP_PREFS_H 4
-#define CHGRP_PREFS_L 8
-#define CHGRP_PREFS_P 12
+typedef unsigned int Prefs;
+#define CHGRP_PREFS_h 0x1
+#define CHGRP_PREFS_R 0x2
+#define CHGRP_PREFS_H 0x4
+#define CHGRP_PREFS_L 0x8
+#define CHGRP_PREFS_P 0xc
 
 
 /* functions */
diff --git a/src/chmod.c b/src/chmod.c
index 4fd8c2e..51bb18a 100644
--- a/src/chmod.c
+++ b/src/chmod.c
@@ -33,7 +33,7 @@
 
 
 /* types */
-typedef int Prefs;
+typedef unsigned int Prefs;
 #define CHMOD_PREFS_R 1
 
 
diff --git a/src/chown.c b/src/chown.c
index 3754085..c01ae30 100644
--- a/src/chown.c
+++ b/src/chown.c
@@ -34,12 +34,12 @@
 
 
 /* types */
-typedef int Prefs;
-#define CHOWN_PREFS_h 1
-#define CHOWN_PREFS_R 2
-#define CHOWN_PREFS_H 4
-#define CHOWN_PREFS_L 8
-#define CHOWN_PREFS_P 12
+typedef unsigned int Prefs;
+#define CHOWN_PREFS_h 0x1
+#define CHOWN_PREFS_R 0x2
+#define CHOWN_PREFS_H 0x4
+#define CHOWN_PREFS_L 0x8
+#define CHOWN_PREFS_P 0xc
 
 
 /* chown */
diff --git a/src/cp.c b/src/cp.c
index 97f49a1..9a2792c 100644
--- a/src/cp.c
+++ b/src/cp.c
@@ -35,7 +35,7 @@
 
 
 /* types */
-typedef int Prefs;
+typedef unsigned int Prefs;
 #define CP_PREFS_f 0x01
 #define CP_PREFS_i 0x02
 #define CP_PREFS_p 0x04
diff --git a/src/df.c b/src/df.c
index bc7ae22..caa582f 100644
--- a/src/df.c
+++ b/src/df.c
@@ -30,7 +30,7 @@
 
 
 /* Prefs */
-typedef int Prefs;
+typedef unsigned int Prefs;
 #define DF_PREFS_k 1
 #define DF_PREFS_P 2
 
diff --git a/src/du.c b/src/du.c
index d0f20f1..c300c70 100644
--- a/src/du.c
+++ b/src/du.c
@@ -30,13 +30,13 @@
 
 
 /* Prefs */
-typedef int Prefs;
-#define DU_PREFS_a 1
-#define DU_PREFS_s 2 
-#define DU_PREFS_x 4
-#define DU_PREFS_k 8 
-#define DU_PREFS_H 16
-#define DU_PREFS_L 48
+typedef unsigned int Prefs;
+#define DU_PREFS_a 0x01
+#define DU_PREFS_s 0x02 
+#define DU_PREFS_x 0x04
+#define DU_PREFS_k 0x08 
+#define DU_PREFS_H 0x10
+#define DU_PREFS_L 0x30
 
 
 /* du */
diff --git a/src/file.c b/src/file.c
index 611d377..e4d1dc1 100644
--- a/src/file.c
+++ b/src/file.c
@@ -27,7 +27,7 @@
 
 
 /* prefs */
-typedef int Prefs;
+typedef unsigned int Prefs;
 #define FILE_PREFS_h	1
 #define FILE_PREFS_m	2
 #define FILE_PREFS_M	4
diff --git a/src/find.c b/src/find.c
index e1fdf15..f837b36 100644
--- a/src/find.c
+++ b/src/find.c
@@ -36,13 +36,11 @@
 
 
 /* types */
-typedef int Prefs;
+typedef unsigned int Prefs;
 #define FIND_PREFS_H 1
 #define FIND_PREFS_L 2
 
 
-/* find */
-/* types */
 typedef enum _FindCmd
 {
 	FC_INVALID = -1,
diff --git a/src/grep.c b/src/grep.c
index c8e4651..d6b2b79 100644
--- a/src/grep.c
+++ b/src/grep.c
@@ -32,7 +32,7 @@
 /* private */
 /* types */
 /* Prefs */
-typedef int Prefs;
+typedef unsigned int Prefs;
 #define GREP_PREFS_n 0x1
 #define GREP_PREFS_q 0x2
 #define GREP_PREFS_s 0x4
diff --git a/src/locale.c b/src/locale.c
index 0307b0a..52aba29 100644
--- a/src/locale.c
+++ b/src/locale.c
@@ -26,7 +26,7 @@
 
 
 /* prefs */
-typedef int Prefs;
+typedef unsigned int Prefs;
 #define LOCALE_PREFS_a 0x1
 #define LOCALE_PREFS_m 0x2
 #define LOCALE_PREFS_c 0x4
diff --git a/src/ls.c b/src/ls.c
index b0ee35d..be22e13 100644
--- a/src/ls.c
+++ b/src/ls.c
@@ -38,7 +38,7 @@
 
 
 /* Prefs */
-typedef int Prefs;
+typedef unsigned int Prefs;
 #define LS_PREFS_C 00001
 #define LS_PREFS_F 00002
 #define LS_PREFS_R 00004
diff --git a/src/mv.c b/src/mv.c
index dcd5048..5ddb2e0 100644
--- a/src/mv.c
+++ b/src/mv.c
@@ -34,7 +34,7 @@
 
 
 /* types */
-typedef int Prefs;
+typedef unsigned int Prefs;
 #define MV_PREFS_f 0x1
 #define MV_PREFS_i 0x2
 
diff --git a/src/rm.c b/src/rm.c
index 90d3fcc..35bc077 100644
--- a/src/rm.c
+++ b/src/rm.c
@@ -31,7 +31,7 @@
 
 
 /* types */
-typedef int Prefs;
+typedef unsigned int Prefs;
 #define RM_PREFS_f 0x1
 #define RM_PREFS_i 0x2
 #define RM_PREFS_R 0x4
diff --git a/src/uniq.c b/src/uniq.c
index 1bd515d..e2054e5 100644
--- a/src/uniq.c
+++ b/src/uniq.c
@@ -27,7 +27,7 @@
 
 
 /* types */
-typedef int Prefs;
+typedef unsigned int Prefs;
 #define UNIQ_PREFS_c 1
 #define UNIQ_PREFS_d 2
 #define UNIQ_PREFS_u 4