diff --git a/mailnews/compose/tests/smtp/smtpTest.cpp b/mailnews/compose/tests/smtp/smtpTest.cpp
index 587ff8ee5e19..df204a5d779e 100644
--- a/mailnews/compose/tests/smtp/smtpTest.cpp
+++ b/mailnews/compose/tests/smtp/smtpTest.cpp
@@ -62,6 +62,7 @@
 #define XPCOM_DLL  "libxpcom.so"
 #define PREF_DLL   "libpref.so"
 #define APPCORES_DLL  "libappcores.so"
+#define APPSHELL_DLL "libnsappshell.so"
 #endif
 #endif