diff --git a/.gitignore b/.gitignore
index 163fd9e..b5e3776 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 build/
-
+flash.bin
 # Random seed file created by test scripts and sample programs
 seedfile
 
diff --git a/zephyr/CMakeLists.txt b/zephyr/CMakeLists.txt
index 638e388..9425a7b 100644
--- a/zephyr/CMakeLists.txt
+++ b/zephyr/CMakeLists.txt
@@ -15,7 +15,7 @@ if(DEFINED NATIVE_POSIX)
     endif ()
     target_include_directories(app PUBLIC ${exposure-notification_SOURCE_DIR}/include)
 
-    FILE(GLOB app_sources ../src/*.c* ${exposure-notification_SOURCE_DIR}/src/*.c*)
+    FILE(GLOB app_sources ../src/*.c* ../src/ens/*.c* ${exposure-notification_SOURCE_DIR}/src/*.c*)
 else()
     FILE(GLOB app_sources ../src/*.c*)
 endif()
diff --git a/zephyr/boards/native_posix_64.conf b/zephyr/boards/native_posix_64.conf
index 0a31b86..a24c0db 100644
--- a/zephyr/boards/native_posix_64.conf
+++ b/zephyr/boards/native_posix_64.conf
@@ -17,7 +17,8 @@ CONFIG_DISPLAY=y
 CONFIG_DISPLAY_LOG_LEVEL_ERR=y
 
 CONFIG_BT=n
-CONFIG_FLASH=n
-# TODO: Add configuration for flash emulation
+# CONFIG_FLASH=n
+CONFIG_FLASH_SIMULATOR=y
 
-CONFIG_HEAP_MEM_POOL_SIZE=32768
+CONFIG_HEAP_MEM_POOL_SIZE=8192
+# CONFIG_HEAP_MEM_POOL_SIZE=32768
diff --git a/zephyr/native_posix_64.overlay b/zephyr/native_posix_64.overlay
new file mode 100644
index 0000000..ee29a41
--- /dev/null
+++ b/zephyr/native_posix_64.overlay
@@ -0,0 +1,12 @@
+&flash0 {
+    partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			label = "ens_storage";
+			reg = <0x0 0x00004000>;
+		};
+	};
+};