diff --git a/icu4c/source/common/punycode.c b/icu4c/source/common/punycode.c
index 29264177789..6fa72b0bed9 100644
--- a/icu4c/source/common/punycode.c
+++ b/icu4c/source/common/punycode.c
@@ -91,7 +91,7 @@ digitToBasic(int32_t digit, UBool uppercase) {
  * point (for use in representing integers) in the range 0 to
  * BASE-1, or -1 if b is does not represent a value.
  */
-static int8_t
+static const int8_t
 basicToDigit[256]={
     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
diff --git a/icu4c/source/common/strprep.cpp b/icu4c/source/common/strprep.cpp
index a69d5968f2f..fc106c038a9 100644
--- a/icu4c/source/common/strprep.cpp
+++ b/icu4c/source/common/strprep.cpp
@@ -32,8 +32,8 @@ static UTrie idnTrie={ 0,0,0,0,0,0,0 };
 static UDataMemory* idnData=NULL;
 static UErrorCode dataErrorCode =U_ZERO_ERROR;
 /* file definitions */
-static const char* DATA_NAME = "uidna";
-static const char* DATA_TYPE = "icu";
+static const char DATA_NAME[] = "uidna";
+static const char DATA_TYPE[] = "icu";
 
 U_CFUNC UBool
 ustrprep_cleanup() {