diff --git a/targets/targets.json b/targets/targets.json
index 1be0427fd6..25ea732dd6 100644
--- a/targets/targets.json
+++ b/targets/targets.json
@@ -1839,7 +1839,7 @@
     },
     "EFM32LG990F256": {
         "inherits": ["EFM32"],
-        "extra_labels": ["EFM32LG", "256K"],
+        "extra_labels_add": ["EFM32LG", "256K"],
         "core": "Cortex-M3",
         "macros": ["EFM32LG990F256", "TRANSACTION_QUEUE_SIZE_SPI=4"],
         "supported_toolchains": ["GCC_ARM", "ARM", "uARM", "IAR"],
@@ -1856,7 +1856,7 @@
     },
     "EFM32WG990F256": {
         "inherits": ["EFM32"],
-        "extra_labels": ["EFM32WG", "256K"],
+        "extra_labels_add": ["EFM32WG", "256K"],
         "core": "Cortex-M4F",
         "macros": ["EFM32WG990F256", "TRANSACTION_QUEUE_SIZE_SPI=4"],
         "supported_toolchains": ["GCC_ARM", "ARM", "uARM", "IAR"],
@@ -1873,7 +1873,7 @@
     },
     "EFM32ZG222F32": {
         "inherits": ["EFM32"],
-        "extra_labels": ["EFM32ZG", "32K"],
+        "extra_labels_add": ["EFM32ZG", "32K"],
         "core": "Cortex-M0+",
         "default_toolchain": "uARM",
         "macros": ["EFM32ZG222F32", "TRANSACTION_QUEUE_SIZE_SPI=0"],
@@ -1891,7 +1891,7 @@
     },
     "EFM32HG322F64": {
         "inherits": ["EFM32"],
-        "extra_labels": ["EFM32HG", "64K"],
+        "extra_labels_add": ["EFM32HG", "64K"],
         "core": "Cortex-M0+",
         "default_toolchain": "uARM",
         "macros": ["EFM32HG322F64", "TRANSACTION_QUEUE_SIZE_SPI=0"],
@@ -1909,7 +1909,7 @@
     },
     "EFM32PG1B100F256GM32": {
         "inherits": ["EFM32"],
-        "extra_labels": ["EFM32PG", "256K"],
+        "extra_labels_add": ["EFM32PG", "256K"],
         "core": "Cortex-M4F",
         "macros": ["EFM32PG1B100F256GM32", "TRANSACTION_QUEUE_SIZE_SPI=4"],
         "supported_toolchains": ["GCC_ARM", "ARM", "uARM", "IAR"],