diff --git a/code/ACLoader.cpp b/code/ACLoader.cpp
index fc00316bf..fccec4e61 100644
--- a/code/ACLoader.cpp
+++ b/code/ACLoader.cpp
@@ -598,6 +598,9 @@ aiNode* AC3DImporter::ConvertObjectSection(Object& object,
 									face.mIndices[i] = cur++;
 
 									// copy vertex positions
+									if ((vertices - mesh->mVertices) >= mesh->mNumVertices) {
+										throw DeadlyImportError("AC3D: Invalid number of vertices");
+									}
 									*vertices = object.vertices[entry.first] + object.translation;