diff --git a/icu4c/source/test/cintltst/cbiditst.c b/icu4c/source/test/cintltst/cbiditst.c
index 3634811435b..517d219df33 100644
--- a/icu4c/source/test/cintltst/cbiditst.c
+++ b/icu4c/source/test/cintltst/cbiditst.c
@@ -2060,19 +2060,19 @@ static void _testManyAddedPoints(void) {
     UChar text[90], dest[MAXLEN], expected[120];
     int destLen, i;
     for (i = 0; i < LENGTHOF(text); i+=3) {
-        text[i] = 'a';
+        text[i] = 0x0061; /* 'a' */
         text[i+1] = 0x05d0;
-        text[i+2] = '3';
+        text[i+2] = 0x0033; /* '3' */
     }
     ubidi_setReorderingMode(bidi, UBIDI_REORDER_INVERSE_LIKE_DIRECT);
     ubidi_setReorderingOptions(bidi, UBIDI_OPTION_INSERT_MARKS);
     ubidi_setPara(bidi, text, LENGTHOF(text), UBIDI_LTR, NULL, &errorCode);
     destLen = ubidi_writeReordered(bidi, dest, MAXLEN, 0, &errorCode);
     for (i = 0; i < LENGTHOF(expected); i+=4) {
-        expected[i] = 'a';
+        expected[i] = 0x0061; /* 'a' */
         expected[i+1] = 0x05d0;
         expected[i+2] = 0x200e;
-        expected[i+3] = '3';
+        expected[i+3] = 0x0033; /* '3' */
     }
     if (memcmp(dest, expected, destLen * sizeof(UChar))) {
         log_err("\nInvalid output with many added points, "
diff --git a/icu4c/source/test/intltest/fldset.cpp b/icu4c/source/test/intltest/fldset.cpp
index 9e0ffb29dcb..6dc384345f6 100644
--- a/icu4c/source/test/intltest/fldset.cpp
+++ b/icu4c/source/test/intltest/fldset.cpp
@@ -100,11 +100,11 @@ int32_t FieldsSet::parseFrom(const UnicodeString& str, const
     }
 
     int32_t destCount = 0;
-    UnicodeString *dest = split(str, ',', destCount);
+    UnicodeString *dest = split(str, 0x002C /* ',' */, destCount);
 
     for(int i = 0; i < destCount; i += 1) {
         int32_t dc = 0;
-        UnicodeString *kv = split(dest[i], '=', dc);
+        UnicodeString *kv = split(dest[i], 0x003D /* '=' */, dc);
 
         if(dc != 2) {
             it_errln(UnicodeString("dc == ") + dc + UnicodeString("?"));
diff --git a/icu4c/source/test/intltest/fldset.h b/icu4c/source/test/intltest/fldset.h
index a1dc4b84295..d471b026c19 100644
--- a/icu4c/source/test/intltest/fldset.h
+++ b/icu4c/source/test/intltest/fldset.h
@@ -111,8 +111,8 @@ class FieldsSet {
     void clear();
     void clear(int32_t field);
     void set(int32_t field, int32_t amount);
-    UBool isSet(int field) const;
-    int32_t get(int field) const;
+    UBool isSet(int32_t field) const;
+    int32_t get(int32_t field) const;
     
     UBool isSameType(const FieldsSet& other) const;
     int32_t fieldCount() const;