diff --git a/modules/sb/fsw/src/cfe_sb_api.c b/modules/sb/fsw/src/cfe_sb_api.c
index 2eb3eedee..377179f4e 100644
--- a/modules/sb/fsw/src/cfe_sb_api.c
+++ b/modules/sb/fsw/src/cfe_sb_api.c
@@ -1398,7 +1398,7 @@ CFE_SB_Buffer_t *CFE_SB_AllocateMessageBuffer(size_t MsgSize)
     if (MsgSize > CFE_MISSION_SB_MAX_SB_MSG_SIZE)
     {
         CFE_ES_GetAppName(AppName, AppId, sizeof(AppName));
-        CFE_ES_WriteToSysLog("%s %s: Failed, requested size %ld larger than allowed %d\n",
+        CFE_ES_WriteToSysLog("%s %s: Failed, requested size %zu larger than allowed %d\n",
                              AppName, __func__, MsgSize, CFE_MISSION_SB_MAX_SB_MSG_SIZE);
         return NULL;
     }