diff --git a/intl/locale/nsLanguageAtomService.cpp b/intl/locale/nsLanguageAtomService.cpp
index 4ccf247e73cf..0a674281005a 100644
--- a/intl/locale/nsLanguageAtomService.cpp
+++ b/intl/locale/nsLanguageAtomService.cpp
@@ -15,7 +15,7 @@
 
 using namespace mozilla;
 
-static const char* kLangGroups[][3] = {
+static const char* const kLangGroups[][3] = {
 #include "langGroups.properties.h"
 };
 
diff --git a/intl/locale/nsUConvPropertySearch.cpp b/intl/locale/nsUConvPropertySearch.cpp
index d9e58d0f9b4e..59b4aed81f9b 100644
--- a/intl/locale/nsUConvPropertySearch.cpp
+++ b/intl/locale/nsUConvPropertySearch.cpp
@@ -13,7 +13,7 @@ struct PropertyComparator
 {
   const nsCString& mKey;
   explicit PropertyComparator(const nsCString& aKey) : mKey(aKey) {}
-  int operator()(const char* (&aProperty)[3]) const {
+  int operator()(const char* const (&aProperty)[3]) const {
     return mKey.Compare(aProperty[0]);
   }
 };
@@ -22,7 +22,7 @@ struct PropertyComparator
 
 // static
 nsresult
-nsUConvPropertySearch::SearchPropertyValue(const char* aProperties[][3],
+nsUConvPropertySearch::SearchPropertyValue(const char* const aProperties[][3],
                                            int32_t aNumberOfProperties,
                                            const nsACString& aKey,
                                            nsACString& aValue)
diff --git a/intl/locale/nsUConvPropertySearch.h b/intl/locale/nsUConvPropertySearch.h
index 09434c9b9094..1330aa5b1210 100644
--- a/intl/locale/nsUConvPropertySearch.h
+++ b/intl/locale/nsUConvPropertySearch.h
@@ -21,7 +21,7 @@ class nsUConvPropertySearch
      *   the return value (empty string if not found)
      * @return NS_OK if found or NS_ERROR_FAILURE if not found
      */
-    static nsresult SearchPropertyValue(const char* aProperties[][3],
+    static nsresult SearchPropertyValue(const char* const aProperties[][3],
                                         int32_t aNumberOfProperties,
                                         const nsACString& aKey,
                                         nsACString& aValue);
diff --git a/intl/locale/unix/nsUNIXCharset.cpp b/intl/locale/unix/nsUNIXCharset.cpp
index 2d97d1536f0c..43d36d99411d 100644
--- a/intl/locale/unix/nsUNIXCharset.cpp
+++ b/intl/locale/unix/nsUNIXCharset.cpp
@@ -29,7 +29,7 @@
 using mozilla::dom::EncodingUtils;
 using namespace mozilla;
 
-static const char* kUnixCharsets[][3] = {
+static const char* const kUnixCharsets[][3] = {
 #include "unixcharset.properties.h"
 };
 
diff --git a/intl/locale/windows/nsWinCharset.cpp b/intl/locale/windows/nsWinCharset.cpp
index 2423d130c745..f0747373cffe 100644
--- a/intl/locale/windows/nsWinCharset.cpp
+++ b/intl/locale/windows/nsWinCharset.cpp
@@ -17,7 +17,7 @@
 
 using namespace mozilla;
 
-static const char* kWinCharsets[][3] = {
+static const char* const kWinCharsets[][3] = {
 #include "wincharset.properties.h"
 };