diff --git a/intl/locale/src/mac/nsDateTimeFormatMac.cpp b/intl/locale/src/mac/nsDateTimeFormatMac.cpp
index cc24a059451c..918e701b4b20 100644
--- a/intl/locale/src/mac/nsDateTimeFormatMac.cpp
+++ b/intl/locale/src/mac/nsDateTimeFormatMac.cpp
@@ -16,7 +16,6 @@
  * Reserved.
  */
 
-#define NS_IMPL_IDS
 #include "nsIServiceManager.h"
 #include "nsICharsetConverterManager.h"
 #include "nsDateTimeFormatMac.h"
diff --git a/intl/locale/src/unix/nsDateTimeFormatUnix.cpp b/intl/locale/src/unix/nsDateTimeFormatUnix.cpp
index 271f89345a39..4597abee6c82 100644
--- a/intl/locale/src/unix/nsDateTimeFormatUnix.cpp
+++ b/intl/locale/src/unix/nsDateTimeFormatUnix.cpp
@@ -16,7 +16,6 @@
  * Reserved.
  */
 
-#define NS_IMPL_IDS
 #include "nsIServiceManager.h"
 #include "nsICharsetConverterManager.h"
 #include "nsDateTimeFormatUnix.h"