diff --git a/Source/cmGeneratorTarget.cxx b/Source/cmGeneratorTarget.cxx
index f4dcd985c6..9e61d9b81e 100644
--- a/Source/cmGeneratorTarget.cxx
+++ b/Source/cmGeneratorTarget.cxx
@@ -1292,7 +1292,6 @@ bool cmGeneratorTarget::IsSystemIncludeDirectory(
   const std::string& dir, const std::string& config,
   const std::string& language) const
 {
-  assert(this->GetType() != cmStateEnums::INTERFACE_LIBRARY);
   std::string config_upper;
   if (!config.empty()) {
     config_upper = cmSystemTools::UpperCase(config);