diff --git a/terraform/eval_context_builtin.go b/terraform/eval_context_builtin.go
index f01292abb..20b37933d 100644
--- a/terraform/eval_context_builtin.go
+++ b/terraform/eval_context_builtin.go
@@ -289,6 +289,7 @@ func (ctx *BuiltinEvalContext) EvaluationScope(self addrs.Referenceable, keyData
 		Evaluator:       ctx.Evaluator,
 		ModulePath:      ctx.PathValue,
 		InstanceKeyData: keyData,
+		Operation:       ctx.Evaluator.Operation,
 	}
 	return ctx.Evaluator.Scope(data, self)
 }
diff --git a/terraform/evaluate.go b/terraform/evaluate.go
index 85be320e6..8e503c3d1 100644
--- a/terraform/evaluate.go
+++ b/terraform/evaluate.go
@@ -91,6 +91,10 @@ type evaluationStateData struct {
 	// since the user specifies in that case which variable name to locally
 	// shadow.)
 	InstanceKeyData InstanceKeyEvalData
+
+	// Operation records the type of walk the evaluationStateData is being used
+	// for.
+	Operation walkOperation
 }
 
 // InstanceKeyEvalData is used during evaluation to specify which values,
@@ -506,6 +510,12 @@ func (d *evaluationStateData) GetResourceInstance(addr addrs.ResourceInstance, r
 		return cty.DynamicVal, diags
 	}
 
+	// Break out early during validation, because resource may not be expanded
+	// yet and indexed references may show up as invalid.
+	if d.Operation == walkValidate {
+		return cty.DynamicVal, diags
+	}
+
 	schema := d.getResourceSchema(addr.ContainingResource(), rs.ProviderConfig)
 
 	// If we are able to automatically convert to the "right" type of instance