diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index 2fb81b722..46204b0f1 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -2345,14 +2345,14 @@ int cmMakefile::ConfigureFile(const char* infile, const char* outfile,
     if(!fout)
       {
       cmSystemTools::Error(
-        "Could not open file for write in copy operatation ", 
+        "Could not open file for write in copy operation ", 
                            tempOutputFile.c_str());
       return 0;
       }
     std::ifstream fin(sinfile.c_str());
     if(!fin)
       {
-      cmSystemTools::Error("Could not open file for read in copy operatation ",
+      cmSystemTools::Error("Could not open file for read in copy operation ",
                            sinfile.c_str());
       return 0;
       }
diff --git a/Source/cmUseMangledMesaCommand.cxx b/Source/cmUseMangledMesaCommand.cxx
index d780dfff8..955607364 100644
--- a/Source/cmUseMangledMesaCommand.cxx
+++ b/Source/cmUseMangledMesaCommand.cxx
@@ -78,14 +78,14 @@ CopyAndFullPathMesaHeader(const char* source,
   std::ofstream fout(tempOutputFile.c_str());
   if(!fout)
     {
-    cmSystemTools::Error("Could not open file for write in copy operatation: ", 
+    cmSystemTools::Error("Could not open file for write in copy operation: ", 
                          tempOutputFile.c_str(), outdir);
     return;
     }
   std::ifstream fin(source);
   if(!fin)
     {
-    cmSystemTools::Error("Could not open file for read in copy operatation",
+    cmSystemTools::Error("Could not open file for read in copy operation",
                          source);
     return;
     }