Index: iseq.c
===================================================================
--- iseq.c	(revision 22918)
+++ iseq.c	(working copy)
@@ -941,7 +941,7 @@
     }
 
     /* show each line */
-    for (i = 0; i < size;) {
+    for (i = 0; i < (int)size;) {
 	i += rb_iseq_disasm_insn(str, iseq, i, iseqdat, child);
     }
 
@@ -1384,7 +1384,7 @@
 
     iseq->iseq = ALLOC_N(VALUE, iseq->iseq_size);
 
-    for (i=0; i<iseq->iseq_size; i+=2) {
+    for (i=0; i<(int)iseq->iseq_size; i+=2) {
 	iseq->iseq[i] = BIN(opt_call_c_function);
 	iseq->iseq[i+1] = (VALUE)func;
     }