diff --git a/code/platformio.ini b/code/platformio.ini
index f63dd446..c85eedf8 100644
--- a/code/platformio.ini
+++ b/code/platformio.ini
@@ -37,7 +37,7 @@ extra_scripts = extra_scripts.py
 
 # ------------------------------------------------------------------------------
 
-[env:espurna-core]
+[env:espurna-core-1MB]
 platform = ${common.platform}
 framework = arduino
 board = esp01_1m
@@ -48,6 +48,17 @@ build_flags = ${common.build_flags_1m} -DITEAD_SONOFF_BASIC -DESPURNA_CORE
 monitor_baud = 115200
 extra_scripts = ${common.extra_scripts}
 
+[env:espurna-core-4MB]
+platform = ${common.platform}
+framework = arduino
+board = d1_mini
+board_flash_mode = dout
+lib_deps = ${common.lib_deps}
+lib_ignore = ${common.lib_ignore}
+build_flags = ${common.build_flags} -DITEAD_SONOFF_BASIC -DESPURNA_CORE
+monitor_baud = 115200
+extra_scripts = ${common.extra_scripts}
+
 # ------------------------------------------------------------------------------
 
 [env:wemos-d1mini-relayshield]