diff --git a/nixos-remote b/nixos-remote
index 67a1934..27ebac6 100755
--- a/nixos-remote
+++ b/nixos-remote
@@ -91,10 +91,11 @@ fetch(){
     exit 1
   fi
 }
-if command -v tar >/dev/null 2>&1; then
+if ! command -v tar >/dev/null 2>&1; then
   echo "no tar command found, but required to unpack kexec tarball" >&2
   exit 1
 fi
+
 rm -rf /root/kexec
 mkdir -p /root/kexec
 fetch "$kexec_url" | tar -C /root/kexec -xvzf-