diff --git a/Source/cmGeneratorTarget.cxx b/Source/cmGeneratorTarget.cxx
index ca056c05f7..ca3e373366 100644
--- a/Source/cmGeneratorTarget.cxx
+++ b/Source/cmGeneratorTarget.cxx
@@ -3945,7 +3945,6 @@ std::string cmGeneratorTarget::GetFortranModuleDirectory(
   std::string const& working_dir) const
 {
   if (!this->FortranModuleDirectoryCreated) {
-    this->FortranModuleDirectory = true;
     this->FortranModuleDirectory =
       this->CreateFortranModuleDirectory(working_dir);
   }