diff --git a/mlir/lib/IR/BuiltinTypes.cpp b/mlir/lib/IR/BuiltinTypes.cpp
--- a/mlir/lib/IR/BuiltinTypes.cpp
+++ b/mlir/lib/IR/BuiltinTypes.cpp
@@ -230,9 +230,9 @@
            << "vector elements must be int/index/float type but got "
            << elementType;
 
-  if (any_of(shape, [](int64_t i) { return i <= 0; }))
+  if (any_of(shape, [](int64_t i) { return i < 0; }))
     return emitError()
-           << "vector types must have positive constant sizes but got "
+           << "vector types must have non-negative constant sizes but got "
            << shape;
 
   return success();