diff --git a/modules/sb/fsw/src/cfe_sb_util.c b/modules/sb/fsw/src/cfe_sb_util.c
index b394e9ad8..bbfa95a7b 100644
--- a/modules/sb/fsw/src/cfe_sb_util.c
+++ b/modules/sb/fsw/src/cfe_sb_util.c
@@ -107,7 +107,7 @@ void *CFE_SB_GetUserData(CFE_MSG_Message_t *MsgPtr)
  */
 size_t CFE_SB_GetUserDataLength(const CFE_MSG_Message_t *MsgPtr)
 {
-    CFE_MSG_Size_t TotalMsgSize;
+    CFE_MSG_Size_t TotalMsgSize = 0;
     size_t         HdrSize;
 
     if (MsgPtr == NULL)