diff --git a/CMakeLists.txt b/CMakeLists.txt
index c7eb016d..605f2248 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -656,6 +656,10 @@ else()
   set(MDBX_ENABLE_TESTS FALSE)
 endif()
 
+if(CI)
+  add_definitions(-DMDBX_CI="${CI}")
+endif()
+
 ################################################################################
 ################################################################################
 
diff --git a/test/extra/crunched_delete.c++ b/test/extra/crunched_delete.c++
index e47a0c35..2d14f423 100644
--- a/test/extra/crunched_delete.c++
+++ b/test/extra/crunched_delete.c++
@@ -7,6 +7,8 @@
 
 #if MDBX_DEBUG || !defined(NDEBUG) || defined(__APPLE__) || defined(_WIN32)
 #define NN 1024
+#elif defined(MDBX_CI)
+#define NN 4096
 #else
 #define NN 16384
 #endif