diff --git a/tools/analyse.cpp b/tools/analyse.cpp
index f8800d6..f1821fa 100644
--- a/tools/analyse.cpp
+++ b/tools/analyse.cpp
@@ -174,13 +174,13 @@ int main (int argc, char const **argv)
     }
 
     emory::chunk::params p = emory::chunk::DEFAULT_PARAMS;
-    if (argc > ARG_BITS + 1)
+    if (argc > ARG_BITS)
         p.bits = cruft::parse::from_string<std::size_t> (argv[ARG_BITS]);
-    if (argc > ARG_WINDOW + 1)
+    if (argc > ARG_WINDOW)
         p.window = cruft::parse::from_string<std::size_t> (argv[ARG_WINDOW]);
-    if (argc > ARG_BITS + 1)
+    if (argc > ARG_MINIMUM)
         p.minimum = cruft::parse::from_string<std::size_t> (argv[ARG_MINIMUM]);
-    if (argc > ARG_MAXIMUM + 1)
+    if (argc > ARG_MAXIMUM)
         p.maximum = cruft::parse::from_string<std::size_t> (argv[ARG_MAXIMUM]);
 
     std::cerr << p << '\n';