diff --git a/library/DFProcess.cpp b/library/DFProcess.cpp
index 08012b8e6..b98022ab9 100644
--- a/library/DFProcess.cpp
+++ b/library/DFProcess.cpp
@@ -145,6 +145,7 @@ bool Process::detach()
     if(result == -1)
     {
         cerr << "couldn't close /proc/"<< my_handle <<"/mem" << endl;
+        perror("mem file close");
         return false;
     }
     else
@@ -155,6 +156,7 @@ bool Process::detach()
         if(result == -1)
         {
             cerr << "couldn't detach from process pid" << my_handle << endl;
+            perror("ptrace detach");
             return false;
         }
         else