1 files changed, 2 insertions, 0 deletions
diff --git a/Source/cmStringCommand.cxx b/Source/cmStringCommand.cxx
index 19f5c0f..bab08fe 100644
--- a/Source/cmStringCommand.cxx
+++ b/Source/cmStringCommand.cxx
@@ -482,6 +482,7 @@ void cmStringCommand::ClearMatches(cmMakefile* mf)
     char name[128];
     sprintf(name, "CMAKE_MATCH_%d", i);
     mf->AddDefinition(name, "");
+    mf->MarkVariableAsUsed(name);
     }
 }
 
@@ -493,6 +494,7 @@ void cmStringCommand::StoreMatches(cmMakefile* mf,cmsys::RegularExpression& re)
     char name[128];
     sprintf(name, "CMAKE_MATCH_%d", i);
     mf->AddDefinition(name, re.match(i).c_str());
+    mf->MarkVariableAsUsed(name);
     }
 }