diff --git a/mozilla/string/public/nsAFlatString.h b/mozilla/string/public/nsAFlatString.h
index 0033762a33b..55aff584c5a 100644
--- a/mozilla/string/public/nsAFlatString.h
+++ b/mozilla/string/public/nsAFlatString.h
@@ -26,7 +26,7 @@
 #ifndef nsAFlatString_h___
 #define nsAFlatString_h___
 
-#ifndef nsASingleFragmenttring_h___
+#ifndef nsASingleFragmentString_h___
 #include "nsASingleFragmentString.h"
 #endif
 
diff --git a/mozilla/xpcom/string/public/nsAFlatString.h b/mozilla/xpcom/string/public/nsAFlatString.h
index 0033762a33b..55aff584c5a 100644
--- a/mozilla/xpcom/string/public/nsAFlatString.h
+++ b/mozilla/xpcom/string/public/nsAFlatString.h
@@ -26,7 +26,7 @@
 #ifndef nsAFlatString_h___
 #define nsAFlatString_h___
 
-#ifndef nsASingleFragmenttring_h___
+#ifndef nsASingleFragmentString_h___
 #include "nsASingleFragmentString.h"
 #endif