diff --git a/mlir/lib/Parser/AttributeParser.cpp b/mlir/lib/Parser/AttributeParser.cpp
--- a/mlir/lib/Parser/AttributeParser.cpp
+++ b/mlir/lib/Parser/AttributeParser.cpp
@@ -833,6 +833,7 @@
 
 /// Parse an opaque elements attribute.
 Attribute Parser::parseOpaqueElementsAttr(Type attrType) {
+  llvm::SMLoc loc = getToken().getLoc();
   consumeToken(Token::kw_opaque);
   if (parseToken(Token::less, "expected '<' after 'opaque'"))
     return nullptr;
@@ -857,7 +858,8 @@
   std::string data;
   if (parseElementAttrHexValues(*this, hexTok, data))
     return nullptr;
-  return OpaqueElementsAttr::get(builder.getStringAttr(name), type, data);
+  return getChecked<OpaqueElementsAttr>(loc, builder.getStringAttr(name), type,
+                                        data);
 }
 
 /// Shaped type for elements attribute.
diff --git a/mlir/test/IR/attribute.mlir b/mlir/test/IR/attribute.mlir
--- a/mlir/test/IR/attribute.mlir
+++ b/mlir/test/IR/attribute.mlir
@@ -645,3 +645,7 @@
   return
 }
 
+// -----
+
+// expected-error @+1 {{invalid dialect namespace '"string with space"'}}
+#invalid_dialect = opaque<"string with space", "0xDEADBEEF"> : tensor<100xi32>