diff --git a/CMakeLists.txt b/CMakeLists.txt
index 190ed8b..eef1146 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -67,6 +67,9 @@ if( BUILD_TESTING )
   add_test( NAME no_arguments
     COMMAND tmux-mem-cpu-load )
 
+  add_test( NAME custom_interval
+    COMMAND tmux-mem-cpu-load -i 3 )
+
   add_test( NAME colors
     COMMAND tmux-mem-cpu-load --colors )
 
@@ -74,7 +77,7 @@ if( BUILD_TESTING )
     COMMAND tmux-mem-cpu-load -i -1 )
 
   add_test( NAME invalid_graph_lines
-    COMMAND tmux-mem-cpu-load -g -4 )
+    COMMAND tmux-mem-cpu-load --graph_lines -2 )
 
   set_tests_properties( usage
     invalid_status_interval
diff --git a/tmux-mem-cpu-load.cpp b/tmux-mem-cpu-load.cpp
index 85b008b..4e343db 100644
--- a/tmux-mem-cpu-load.cpp
+++ b/tmux-mem-cpu-load.cpp
@@ -85,7 +85,7 @@ std::string cpu_string(unsigned int cpu_usage_delay, unsigned int graph_lines,
 int main(int argc, char** argv) {
   using namespace ArgvParse;
 
-  unsigned cpu_usage_delay = 1000000;
+  unsigned cpu_usage_delay = 990000;
   short graph_lines = 10; // max 32767 should be enough
   bool use_colors = false;
 
@@ -127,7 +127,7 @@ int main(int argc, char** argv) {
 	  std::cerr << "Status interval argument must be one or greater.\n";
 	  return EXIT_FAILURE;
 	}
-	cpu_usage_delay = delay * 1000000;
+	cpu_usage_delay = delay * 1000000 - 10000;
   }
 
   if (arg.foundOption("graph-lines")) {