diff --git a/CMakeLists.txt b/CMakeLists.txt
index 967684f..2c01ac4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.25)
-project(blt-gp VERSION 0.1.38)
+project(blt-gp VERSION 0.1.39)
 
 include(CTest)
 
diff --git a/include/blt/gp/fwdecl.h b/include/blt/gp/fwdecl.h
index 8311bac..5e751e2 100644
--- a/include/blt/gp/fwdecl.h
+++ b/include/blt/gp/fwdecl.h
@@ -28,6 +28,7 @@
 
 namespace blt::gp
 {
+#ifdef BLT_TRACK_ALLOCATIONS
     inline allocation_tracker_t tracker;
     inline call_tracker_t crossover_calls;
     inline call_tracker_t mutation_calls;
@@ -35,6 +36,7 @@ namespace blt::gp
     inline call_tracker_t crossover_allocations;
     inline call_tracker_t mutation_allocations;
     inline call_tracker_t reproduction_allocations;
+#endif
     
     class gp_program;
     
@@ -66,9 +68,14 @@ namespace blt::gp
     
     template<typename T>
     class tracked_allocator_t;
-    
+
+#ifdef BLT_TRACK_ALLOCATIONS
     template<typename T>
     using tracked_vector = std::vector<T, tracked_allocator_t<T>>;
+#else
+    template<typename T>
+    using tracked_vector = std::vector<T>;
+#endif
     
 //    using operation_vector_t = tracked_vector<op_container_t>;
 //    using individual_vector_t = tracked_vector<individual_t, tracked_allocator_t<individual_t>>;