diff --git a/CMakeLists.txt b/CMakeLists.txt
index 484f30d..2dd503d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.25)
-project(blt-gp VERSION 0.1.8)
+project(blt-gp VERSION 0.1.9)
 
 include(CTest)
 
diff --git a/include/blt/gp/stack.h b/include/blt/gp/stack.h
index da808a3..be3a9fa 100644
--- a/include/blt/gp/stack.h
+++ b/include/blt/gp/stack.h
@@ -20,6 +20,7 @@
 #define BLT_GP_STACK_H
 
 #include <blt/std/types.h>
+#include <blt/std/atomic_allocator.h>
 #include <blt/std/assert.h>
 #include <blt/std/logging.h>
 #include <blt/std/allocator.h>