diff --git a/webshell/tests/viewer/nsStubs.cpp b/webshell/tests/viewer/nsStubs.cpp
index 4cb4f4b70d86..beab94f7fdc7 100644
--- a/webshell/tests/viewer/nsStubs.cpp
+++ b/webshell/tests/viewer/nsStubs.cpp
@@ -13,7 +13,7 @@ extern "C" XP_Bool ValidateDocData(MWContext *window_id)
 }
 
 /* dist/public/xp/xp_linebuf.h */
-int XP_ReBuffer (const char *net_buffer, int32 net_buffer_size,
+extern "C" int XP_ReBuffer (const char *net_buffer, int32 net_buffer_size,
                         uint32 desired_buffer_size,
                         char **bufferP, uint32 *buffer_sizeP,
                         uint32 *buffer_fpP,
diff --git a/xpfe/xpviewer/src/nsUnixStubs.cpp b/xpfe/xpviewer/src/nsUnixStubs.cpp
index a5cec7f8227a..8b53d80d6bdc 100644
--- a/xpfe/xpviewer/src/nsUnixStubs.cpp
+++ b/xpfe/xpviewer/src/nsUnixStubs.cpp
@@ -17,7 +17,7 @@ extern "C" XP_Bool ValidateDocData(MWContext *window_id)
 }
 
 /* dist/public/xp/xp_linebuf.h */
-int XP_ReBuffer (const char *net_buffer, int32 net_buffer_size,
+extern "C" int XP_ReBuffer (const char *net_buffer, int32 net_buffer_size,
                         uint32 desired_buffer_size,
                         char **bufferP, uint32 *buffer_sizeP,
                         uint32 *buffer_fpP,