diff --git a/testcases/t/172-start-on-named-ws.t b/testcases/t/172-start-on-named-ws.t
index 9e6806a4..09b708be 100644
--- a/testcases/t/172-start-on-named-ws.t
+++ b/testcases/t/172-start-on-named-ws.t
@@ -70,4 +70,22 @@ is_deeply(\@names, [ 'foobar' ], 'i3 starts on named workspace foobar');
 
 exit_gracefully($pid);
 
+################################################################################
+# 4: now with whitespace in front of the workspace number
+################################################################################
+
+$config = <<EOT;
+# i3 config file (v4)
+font -misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1
+
+bindsym Mod1+1 workspace   3
+EOT
+
+$pid = launch_with_config($config);
+
+@names = @{get_workspace_names()};
+is_deeply(\@names, [ '3' ], 'i3 starts on workspace 3 without whitespace');
+
+exit_gracefully($pid);
+
 done_testing;