diff --git a/uri/scheme.py b/uri/scheme.py
index 0d225cf..dec1c47 100644
--- a/uri/scheme.py
+++ b/uri/scheme.py
@@ -16,6 +16,8 @@ def __eq__(self, other: "SchemeLike"):
         if isinstance(other, self.__class__):
             return self is other
 
+        raise RuntimeError(f"Cannot compare objects - incompatible types, " f"self: {type(self)}, other: {type(other)}")
+
     def __hash__(self) -> int:
         return hash(self.name)