diff --git a/security/manager/ssl/src/nsCMS.cpp b/security/manager/ssl/src/nsCMS.cpp
index 565ef99346d..8963ee821ab 100644
--- a/security/manager/ssl/src/nsCMS.cpp
+++ b/security/manager/ssl/src/nsCMS.cpp
@@ -769,6 +769,7 @@ loser:
 NS_IMPL_THREADSAFE_ISUPPORTS1(nsCMSDecoder, nsICMSDecoder)
 
 nsCMSDecoder::nsCMSDecoder()
+: m_dcx(nsnull)
 {
 }