diff --git a/source/Commands/CommandObjectTarget.cpp b/source/Commands/CommandObjectTarget.cpp
index d154e28..391cbc4 100644
--- a/source/Commands/CommandObjectTarget.cpp
+++ b/source/Commands/CommandObjectTarget.cpp
@@ -876,7 +876,7 @@
                                                               comp_unit->GetDirectory().GetCString(), 
                                                               comp_unit->GetFilename().GetCString());
                             else
-                                result.AppendError ("no debug information for frame %u\n", frame->GetFrameIndex());
+                                result.AppendErrorWithFormat ("no debug information for frame %u\n", frame->GetFrameIndex());
                         }                        
                         else
                             result.AppendError ("'target variable' takes one or more global variable names as arguments\n");
@@ -3152,13 +3152,13 @@
                         }
                         else
                         {
-                            result.AppendError ("Couldn't find module matching address: 0x%" PRIx64 ".", m_options.m_module_addr);
+                            result.AppendErrorWithFormat ("Couldn't find module matching address: 0x%" PRIx64 ".", m_options.m_module_addr);
                             result.SetStatus (eReturnStatusFailed);
                         }
                     }
                     else
                     {
-                        result.AppendError ("Couldn't find module containing address: 0x%" PRIx64 ".", m_options.m_module_addr);
+                        result.AppendErrorWithFormat ("Couldn't find module containing address: 0x%" PRIx64 ".", m_options.m_module_addr);
                         result.SetStatus (eReturnStatusFailed);
                     }
                 }