diff --git a/targets/TARGET_Analog_Devices/TARGET_ADUCM302X/TARGET_ADUCM3029/api/flash_api.c b/targets/TARGET_Analog_Devices/TARGET_ADUCM302X/TARGET_ADUCM3029/api/flash_api.c
index feae0e3d98..304219e8af 100755
--- a/targets/TARGET_Analog_Devices/TARGET_ADUCM302X/TARGET_ADUCM3029/api/flash_api.c
+++ b/targets/TARGET_Analog_Devices/TARGET_ADUCM302X/TARGET_ADUCM3029/api/flash_api.c
@@ -76,7 +76,7 @@ static const sector_info_t sectors_info[] = {
 };
 
 static const flash_target_config_t flash_target_config = {
-    .page_size   = 0x800,
+    .page_size   = 0x8,                       // minimal programmable unit size
     .flash_start = 0x0,
     .flash_size  = 0x00040000,
     .sectors     = sectors_info,
diff --git a/targets/TARGET_Analog_Devices/TARGET_ADUCM4X50/TARGET_ADUCM4050/api/flash_api.c b/targets/TARGET_Analog_Devices/TARGET_ADUCM4X50/TARGET_ADUCM4050/api/flash_api.c
index 25afcc193f..2779c4cb5a 100755
--- a/targets/TARGET_Analog_Devices/TARGET_ADUCM4X50/TARGET_ADUCM4050/api/flash_api.c
+++ b/targets/TARGET_Analog_Devices/TARGET_ADUCM4X50/TARGET_ADUCM4050/api/flash_api.c
@@ -74,7 +74,7 @@ static const sector_info_t sectors_info[] = {
 };
 
 static const flash_target_config_t flash_target_config = {
-    .page_size   = 0x800,
+    .page_size   = 0x8,                       // minimal programmable unit size
     .flash_start = 0x0,
     .flash_size  = 0x0007F000,
     .sectors     = sectors_info,