diff --git a/icu4c/source/common/rbbiscan.cpp b/icu4c/source/common/rbbiscan.cpp
index 776b7d21edc..d18a4d25a49 100644
--- a/icu4c/source/common/rbbiscan.cpp
+++ b/icu4c/source/common/rbbiscan.cpp
@@ -787,7 +787,7 @@ void RBBIRuleScanner::nextChar(RBBIRuleChar &c) {
             //    the middle (a variable name, for example.)
             for (;;) {
                 c.fChar = nextCharLL();
-                if (c.fChar == -1       ||  // EOF
+                if (c.fChar == (UChar32)-1 ||  // EOF
                     c.fChar == chCR     ||
                     c.fChar == chLF     ||
                     c.fChar == chNEL    ||
@@ -886,12 +886,12 @@ void RBBIRuleScanner::parse() {
                 // Table row specified "escaped P" and the char is either 'p' or 'P'.
                 break;
             }
-            if (tableEl->fCharClass == 252 && fC.fChar == -1)  {
+            if (tableEl->fCharClass == 252 && fC.fChar == (UChar32)-1)  {
                 // Table row specified eof and we hit eof on the input.
                 break;
             }
 
-            if (tableEl->fCharClass >= 128 && tableEl->fCharClass < 240 && fC.fChar != -1) {
+            if (tableEl->fCharClass >= 128 && tableEl->fCharClass < 240 && fC.fChar != (UChar32)-1) {
                 UnicodeSet *uniset = fRuleSets[tableEl->fCharClass-128];
                 if (uniset->contains(fC.fChar)) {
                     // Table row specified a character class, or set of characters,
diff --git a/icu4c/source/common/unicode/usetiter.h b/icu4c/source/common/unicode/usetiter.h
index ce7f07970b6..f9d58fc8af8 100644
--- a/icu4c/source/common/unicode/usetiter.h
+++ b/icu4c/source/common/unicode/usetiter.h
@@ -4,7 +4,7 @@
 * Corporation and others.  All Rights Reserved.
 **********************************************************************
 * $Source: /xsrl/Nsvn/icu/icu/source/common/unicode/usetiter.h,v $ 
-* $Revision: 1.5 $
+* $Revision: 1.6 $
 **********************************************************************
 */
 #ifndef USETITER_H
@@ -236,7 +236,7 @@ private:
 };
 
 inline UBool UnicodeSetIterator::isString() const {
-    return codepoint == IS_STRING;
+    return codepoint == (UChar32)IS_STRING;
 }
 
 inline UChar32 UnicodeSetIterator::getCodepoint() const {
diff --git a/icu4c/source/common/usetiter.cpp b/icu4c/source/common/usetiter.cpp
index 522e0ffe966..cc562f4dcc1 100644
--- a/icu4c/source/common/usetiter.cpp
+++ b/icu4c/source/common/usetiter.cpp
@@ -4,8 +4,8 @@
 * Corporation and others.  All Rights Reserved.
 **********************************************************************
 * $Source: /xsrl/Nsvn/icu/icu/source/common/usetiter.cpp,v $ 
-* $Date: 2002/06/28 23:53:51 $ 
-* $Revision: 1.3 $
+* $Date: 2002/08/22 21:01:43 $ 
+* $Revision: 1.4 $
 **********************************************************************
 */
 #include "unicode/usetiter.h"
@@ -58,7 +58,7 @@ UBool UnicodeSetIterator::next() {
     }
 
     if (nextString >= stringCount) return FALSE;
-    codepoint = IS_STRING; // signal that value is actually a string
+    codepoint = (UChar32)IS_STRING; // signal that value is actually a string
     string = (const UnicodeString*) set->strings->elementAt(nextString++);
     return TRUE;
 }
@@ -90,7 +90,7 @@ UBool UnicodeSetIterator::nextRange() {
     }
 
     if (nextString >= stringCount) return FALSE;
-    codepoint = IS_STRING; // signal that value is actually a string
+    codepoint = (UChar32)IS_STRING; // signal that value is actually a string
     string = (const UnicodeString*) set->strings->elementAt(nextString++);
     return TRUE;
 }