diff --git a/mlir/lib/ExecutionEngine/SparseTensor/File.cpp b/mlir/lib/ExecutionEngine/SparseTensor/File.cpp
--- a/mlir/lib/ExecutionEngine/SparseTensor/File.cpp
+++ b/mlir/lib/ExecutionEngine/SparseTensor/File.cpp
@@ -108,6 +108,8 @@
     // integer and floating primary-types.
     return isRealPrimaryType(valTy);
   }
+  MLIR_SPARSETENSOR_FATAL("Unknown ValueKind: %d\n",
+                          static_cast<uint8_t>(valueKind_));
 }
 
 /// Helper to convert C-style strings (i.e., '\0' terminated) to lower case.