diff --git a/kaleid/kernel/sh/shcmds.c b/kaleid/kernel/sh/shcmds.c
index ad68bda..af245e2 100644
--- a/kaleid/kernel/sh/shcmds.c
+++ b/kaleid/kernel/sh/shcmds.c
@@ -108,12 +108,16 @@ error_t CmdDmesg(int argc, char **argv, char *cmdline)
     size_t N = 0;
 
     if (argc == 1) N = 999;
-    else if (argc == 2) N = atoi(argv[1]);
+    else if (argc == 2) N = 1 + atoi(argv[1]);
     else {
         KernLog("dmesg: no more than one argument\n");
         return EINVAL;
     }
 
+    DebugLog("dmesg requested from kernel shell (N=%d)\n", N);
+
+    if (N == 0) return EOK;
+
     BLockBuf(BStdDbg);
 
     ptr = (char *)lmax((ulong)BStdDbg->buf,