diff --git a/ChangeLog b/ChangeLog
index 82307b0eafed53..281522082151af 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Mar 25 11:34:00 2010  Kenta Murata  <mrkn@mrkn.jp>
+
+	* bignum.c, node.h, strftime.c, enc/trans/utf8_mac.trans:
+	  added explicit casts for supplessing warnings.
+
 Thu Mar 25 11:34:00 2010  Kenta Murata  <mrkn@mrkn.jp>
 
 	* test/ruby/test_dir_m17n.rb: HFS+ escapes invalid byte sequences of
diff --git a/bignum.c b/bignum.c
index e79e5f4888af49..63635a62e5135a 100644
--- a/bignum.c
+++ b/bignum.c
@@ -2397,7 +2397,7 @@ bigdivrem(VALUE x, VALUE y, volatile VALUE *divp, volatile VALUE *modp)
 
     dd = 0;
     q = yds[ny-1];
-    while ((q & (1UL<<(BITSPERDIG-1))) == 0) {
+    while ((q & (BDIGIT)(1UL<<(BITSPERDIG-1))) == 0) {
 	q <<= 1UL;
 	dd++;
     }
diff --git a/enc/trans/utf8_mac.trans b/enc/trans/utf8_mac.trans
index ecda465355ff0d..3ceb07eeb4348d 100644
--- a/enc/trans/utf8_mac.trans
+++ b/enc/trans/utf8_mac.trans
@@ -193,7 +193,7 @@ fun_so_from_utf8_mac(void *statep,
         unsigned char *o, size_t osize)
 {
     struct from_utf8_mac_status *sp = statep;
-    int n = 0;
+    ssize_t n = 0;
 
     switch (l) {
       case 1:
diff --git a/node.h b/node.h
index 4eb3ded7a25d9c..f8cf7de7b29859 100644
--- a/node.h
+++ b/node.h
@@ -269,7 +269,7 @@ typedef struct RNode {
 
 #define nd_type(n) ((int) (((RNODE(n))->flags & NODE_TYPEMASK)>>NODE_TYPESHIFT))
 #define nd_set_type(n,t) \
-    RNODE(n)->flags=((RNODE(n)->flags&~NODE_TYPEMASK)|(((t)<<NODE_TYPESHIFT)&NODE_TYPEMASK))
+    RNODE(n)->flags=((RNODE(n)->flags&~NODE_TYPEMASK)|((((unsigned long)t)<<NODE_TYPESHIFT)&NODE_TYPEMASK))
 
 #define NODE_LSHIFT (NODE_TYPESHIFT+7)
 #define NODE_LMASK  (((SIGNED_VALUE)1<<(sizeof(VALUE)*CHAR_BIT-NODE_LSHIFT))-1)
diff --git a/strftime.c b/strftime.c
index db6591b77de517..f03d5466695e1b 100644
--- a/strftime.c
+++ b/strftime.c
@@ -197,7 +197,8 @@ rb_strftime(char *s, size_t maxsize, const char *format, const struct vtm *vtm,
 	const char *sp, *tp;
 	auto char tbuf[100];
 	long off;
-	int i, w;
+	ptrdiff_t i;
+	int w;
 	long y;
 	static short first = 1;
 #ifdef POSIX_SEMANTICS
@@ -411,12 +412,12 @@ rb_strftime(char *s, size_t maxsize, const char *format, const struct vtm *vtm,
 
 		case 'd':	/* day of the month, 01 - 31 */
 			i = range(1, vtm->mday, 31);
-			FMT('0', 2, "d", i);
+			FMT('0', 2, "d", (int)i);
 			continue;
 
 		case 'H':	/* hour, 24-hour clock, 00 - 23 */
 			i = range(0, vtm->hour, 23);
-			FMT('0', 2, "d", i);
+			FMT('0', 2, "d", (int)i);
 			continue;
 
 		case 'I':	/* hour, 12-hour clock, 01 - 12 */
@@ -425,7 +426,7 @@ rb_strftime(char *s, size_t maxsize, const char *format, const struct vtm *vtm,
 				i = 12;
 			else if (i > 12)
 				i -= 12;
-			FMT('0', 2, "d", i);
+			FMT('0', 2, "d", (int)i);
 			continue;
 
 		case 'j':	/* day of the year, 001 - 366 */
@@ -434,12 +435,12 @@ rb_strftime(char *s, size_t maxsize, const char *format, const struct vtm *vtm,
 
 		case 'm':	/* month, 01 - 12 */
 			i = range(1, vtm->mon, 12);
-			FMT('0', 2, "d", i);
+			FMT('0', 2, "d", (int)i);
 			continue;
 
 		case 'M':	/* minute, 00 - 59 */
 			i = range(0, vtm->min, 59);
-			FMT('0', 2, "d", i);
+			FMT('0', 2, "d", (int)i);
 			continue;
 
 		case 'p':	/* AM or PM based on 12-hour clock */
@@ -466,7 +467,7 @@ rb_strftime(char *s, size_t maxsize, const char *format, const struct vtm *vtm,
 
 		case 'S':	/* second, 00 - 60 */
 			i = range(0, vtm->sec, 60);
-			FMT('0', 2, "d", i);
+			FMT('0', 2, "d", (int)i);
 			continue;
 
 		case 'U':	/* week of year, Sunday is first day of week */
@@ -475,7 +476,7 @@ rb_strftime(char *s, size_t maxsize, const char *format, const struct vtm *vtm,
 
 		case 'w':	/* weekday, Sunday == 0, 0 - 6 */
 			i = range(0, vtm->wday, 6);
-			FMT('0', 1, "d", i);
+			FMT('0', 1, "d", (int)i);
 			continue;
 
 		case 'W':	/* week of year, Monday is first day of week */
@@ -492,7 +493,7 @@ rb_strftime(char *s, size_t maxsize, const char *format, const struct vtm *vtm,
 
 		case 'y':	/* year without a century, 00 - 99 */
 			i = NUM2INT(mod(vtm->year, INT2FIX(100)));
-			FMT('0', 2, "d", i);
+			FMT('0', 2, "d", (int)i);
 			continue;
 
 		case 'Y':	/* year with century */
@@ -658,7 +659,7 @@ rb_strftime(char *s, size_t maxsize, const char *format, const struct vtm *vtm,
 #ifdef SUNOS_EXT
 		case 'k':	/* hour, 24-hour clock, blank pad */
 			i = range(0, vtm->hour, 23);
-			FMT(' ', 2, "d", i);
+			FMT(' ', 2, "d", (int)i);
 			continue;
 
 		case 'l':	/* hour, 12-hour clock, 1 - 12, blank pad */
@@ -667,7 +668,7 @@ rb_strftime(char *s, size_t maxsize, const char *format, const struct vtm *vtm,
 				i = 12;
 			else if (i > 12)
 				i -= 12;
-			FMT(' ', 2, "d", i);
+			FMT(' ', 2, "d", (int)i);
 			continue;
 #endif