diff --git a/docshell/base/nsWebShell.cpp b/docshell/base/nsWebShell.cpp
index 5a189e60dd9a..5e50aa075314 100644
--- a/docshell/base/nsWebShell.cpp
+++ b/docshell/base/nsWebShell.cpp
@@ -546,6 +546,7 @@ public:
 #ifdef NS_DEBUG
 unsigned long nsWebShell::gNumberOfWebShells = 0;
 
+extern "C" NS_WEB
 unsigned long
 NS_TotalWebShellsInExistence()
 	{
diff --git a/webshell/src/nsWebShell.cpp b/webshell/src/nsWebShell.cpp
index 5a189e60dd9a..5e50aa075314 100644
--- a/webshell/src/nsWebShell.cpp
+++ b/webshell/src/nsWebShell.cpp
@@ -546,6 +546,7 @@ public:
 #ifdef NS_DEBUG
 unsigned long nsWebShell::gNumberOfWebShells = 0;
 
+extern "C" NS_WEB
 unsigned long
 NS_TotalWebShellsInExistence()
 	{