diff --git a/mozilla/js/js2/jstypes.cpp b/mozilla/js/js2/jstypes.cpp
index 03582f4258e..a005ae9905d 100644
--- a/mozilla/js/js2/jstypes.cpp
+++ b/mozilla/js/js2/jstypes.cpp
@@ -170,7 +170,7 @@ JSValue JSValue::toPrimitive(ECMA_type hint) const
 
 JSValue JSValue::valueToString(const JSValue& value) // can assume value is not a string
 {
-    char *chrp;
+    const char* chrp;
     char buf[dtosStandardBufferSize];
     switch (value.tag) {
     case i32_tag:
diff --git a/mozilla/js2/src/jstypes.cpp b/mozilla/js2/src/jstypes.cpp
index 03582f4258e..a005ae9905d 100644
--- a/mozilla/js2/src/jstypes.cpp
+++ b/mozilla/js2/src/jstypes.cpp
@@ -170,7 +170,7 @@ JSValue JSValue::toPrimitive(ECMA_type hint) const
 
 JSValue JSValue::valueToString(const JSValue& value) // can assume value is not a string
 {
-    char *chrp;
+    const char* chrp;
     char buf[dtosStandardBufferSize];
     switch (value.tag) {
     case i32_tag: