diff --git a/xpcom/base/nsDebug.cpp b/xpcom/base/nsDebug.cpp
index 70f5b8f68cb..80da09e5c80 100644
--- a/xpcom/base/nsDebug.cpp
+++ b/xpcom/base/nsDebug.cpp
@@ -287,7 +287,7 @@ NS_COM void nsDebug::Assertion(const char* aStr, const char* aExpr,
       }
 #endif
 
-   //Break(aFile, aLine);
+   Break(aFile, aLine);
 }
 
 NS_COM void nsDebug::Break(const char* aFile, PRIntn aLine)
diff --git a/xpcom/glue/nsDebug.cpp b/xpcom/glue/nsDebug.cpp
index 70f5b8f68cb..80da09e5c80 100644
--- a/xpcom/glue/nsDebug.cpp
+++ b/xpcom/glue/nsDebug.cpp
@@ -287,7 +287,7 @@ NS_COM void nsDebug::Assertion(const char* aStr, const char* aExpr,
       }
 #endif
 
-   //Break(aFile, aLine);
+   Break(aFile, aLine);
 }
 
 NS_COM void nsDebug::Break(const char* aFile, PRIntn aLine)