diff --git a/ortools/math_opt/core/solver_interface.h b/ortools/math_opt/core/solver_interface.h
index 0f9586f0703..976a9675476 100644
--- a/ortools/math_opt/core/solver_interface.h
+++ b/ortools/math_opt/core/solver_interface.h
@@ -205,7 +205,7 @@ class AllSolversRegistry {
   namespace {                                                              \
   const void* const kRegisterSolver ABSL_ATTRIBUTE_UNUSED = [] {           \
     std::cerr << "registering " << ProtoEnumToString(solver_type) << std::endl; \
-    AllSolversRegistry::Instance()->Register(solver_type, solver_factory); \
+    /*AllSolversRegistry::Instance()->Register(solver_type, solver_factory);*/ \
     std::cerr << "registering " << ProtoEnumToString(solver_type) << "...DONE" << std::endl; \
     return nullptr;                                                        \
   }();                                                                     \