diff --git a/pcp/PCPProcessList.c b/pcp/PCPProcessList.c
index f544fd71..ef37da2d 100644
--- a/pcp/PCPProcessList.c
+++ b/pcp/PCPProcessList.c
@@ -281,7 +281,7 @@ static void PCPProcessList_updateCmdline(Process* process, int pid, int offset,
       ++command;
       --length;
       if (command[length-1] == ')')
-         command[length-1] = '\0';
+         command[--length] = '\0';
       process->isKernelThread = true;
    }