diff --git a/include/RhythmGameUtilities/Enums/Difficulty.h b/include/RhythmGameUtilities/Enums/Difficulty.h
index e29e47f..7824a33 100644
--- a/include/RhythmGameUtilities/Enums/Difficulty.h
+++ b/include/RhythmGameUtilities/Enums/Difficulty.h
@@ -34,6 +34,8 @@ std::string ToString(Difficulty difficulty)
         return "Hard";
     case Expert:
         return "Expert";
+    default:
+        throw std::invalid_argument("Unknown Difficulty");
     }
 }
 
diff --git a/include/RhythmGameUtilities/Enums/NamedSection.h b/include/RhythmGameUtilities/Enums/NamedSection.h
index 073b1e4..6864159 100644
--- a/include/RhythmGameUtilities/Enums/NamedSection.h
+++ b/include/RhythmGameUtilities/Enums/NamedSection.h
@@ -27,6 +27,8 @@ std::string ToString(NamedSection namedSection)
         return "SyncTrack";
     case Events:
         return "Events";
+    default:
+        throw std::invalid_argument("Unknown NamedSection");
     }
 }
 
diff --git a/include/RhythmGameUtilities/Enums/TypeCode.h b/include/RhythmGameUtilities/Enums/TypeCode.h
index 159ff69..ab0d3cc 100644
--- a/include/RhythmGameUtilities/Enums/TypeCode.h
+++ b/include/RhythmGameUtilities/Enums/TypeCode.h
@@ -34,6 +34,8 @@ std::string ToString(TypeCode typeCode)
         return "N";
     case EventMarker:
         return "E";
+    default:
+        throw std::invalid_argument("Unknown TypeCode");
     }
 }