diff --git a/src/CppParser/Parser.cpp b/src/CppParser/Parser.cpp
index e9ad937e..d5b07e14 100644
--- a/src/CppParser/Parser.cpp
+++ b/src/CppParser/Parser.cpp
@@ -707,6 +707,8 @@ WalkTemplateSpecializationKind(clang::TemplateSpecializationKind Kind)
     case clang::TSK_ExplicitInstantiationDefinition:
         return TemplateSpecializationKind::ExplicitInstantiationDefinition;
     }
+
+    llvm_unreachable("Unknown template specialization kind");
 }
 
 ClassTemplateSpecialization*
diff --git a/src/Parser/Parser.cpp b/src/Parser/Parser.cpp
index 677417ce..bc0e1ec8 100644
--- a/src/Parser/Parser.cpp
+++ b/src/Parser/Parser.cpp
@@ -710,6 +710,8 @@ WalkTemplateSpecializationKind(clang::TemplateSpecializationKind Kind)
     case TSK_ExplicitInstantiationDefinition:
         return CppSharp::AST::TemplateSpecializationKind::ExplicitInstantiationDefinition;
     }
+
+    llvm_unreachable("Unknown template specialization kind");
 }
 
 CppSharp::AST::ClassTemplateSpecialization^