diff --git a/chat/nss-purple.def b/chat/nss-purple.def
new file mode 100644
index 0000000000..f2238931c0
--- /dev/null
+++ b/chat/nss-purple.def
@@ -0,0 +1,5 @@
+PK11_PubEncryptRaw
+PK11_PubDecryptRaw
+PK11_Verify
+PK11_RestoreContext
+PK11_SaveContextAlloc
diff --git a/im/confvars.sh b/im/confvars.sh
index 55f0be2d86..02e0f4724b 100644
--- a/im/confvars.sh
+++ b/im/confvars.sh
@@ -24,3 +24,6 @@ MOZ_APP_ID={33cb9019-c295-46dd-be21-8c4936574bee}
 if test "$OS_TARGET" = "WINNT" -o "$OS_TARGET" = "Darwin"; then
   MOZ_FOLD_LIBS=1
 fi
+if test "$OS_TARGET" = "WINNT"; then
+  NSS_EXTRA_SYMBOLS_FILE=../../../../chat/nss-purple.def
+fi