diff --git a/xpcom/base/nsMemoryImpl.cpp b/xpcom/base/nsMemoryImpl.cpp
index c6e3a23ac96..03de56433b1 100644
--- a/xpcom/base/nsMemoryImpl.cpp
+++ b/xpcom/base/nsMemoryImpl.cpp
@@ -392,7 +392,7 @@ NS_Free(void* ptr)
 
 #ifdef NS_MEMORY_FLUSHER_THREAD
 
-NS_IMPL_QUERY_INTERFACE1(MemoryFlusher, nsIRunnable);
+NS_IMPL_QUERY_INTERFACE1(MemoryFlusher, nsIRunnable)
 
 NS_IMETHODIMP
 MemoryFlusher::Run()