diff --git a/Source/cmGetSourceFilePropertyCommand.cxx b/Source/cmGetSourceFilePropertyCommand.cxx
index efd9776533..8e4d3b280a 100644
--- a/Source/cmGetSourceFilePropertyCommand.cxx
+++ b/Source/cmGetSourceFilePropertyCommand.cxx
@@ -39,7 +39,7 @@ bool cmGetSourceFilePropertyCommand::InitialPass(
       }
     }
 
-  m_Makefile->AddDefinition(var, "NOT_FOUND");
+  m_Makefile->AddDefinition(var, "NOTFOUND");
   return true;
 }
 
diff --git a/Source/cmGetTargetPropertyCommand.cxx b/Source/cmGetTargetPropertyCommand.cxx
index 21626ace7b..7c35aafb41 100644
--- a/Source/cmGetTargetPropertyCommand.cxx
+++ b/Source/cmGetTargetPropertyCommand.cxx
@@ -39,7 +39,7 @@ bool cmGetTargetPropertyCommand::InitialPass(
       return true;
       }
     }
-  m_Makefile->AddDefinition(var, "NOT_FOUND");
+  m_Makefile->AddDefinition(var, "NOTFOUND");
   return true;
 }