diff --git a/targets/targets.json b/targets/targets.json
index 34586f931d..34bde00853 100644
--- a/targets/targets.json
+++ b/targets/targets.json
@@ -6646,7 +6646,7 @@
             "TC_ASYNC=true"
         ],
         "extra_labels": ["Atmel", "SAM_CortexM0P", "SAMR21"],
-        "supported_toolchains": ["GCC_ARM", "ARM", "uARM"],
+        "supported_toolchains": ["GCC_ARM", "ARMC5", "uARM"],
         "device_has": [
             "ANALOGIN",
             "I2C",
@@ -6679,7 +6679,7 @@
             "TC_ASYNC=true"
         ],
         "extra_labels": ["Atmel", "SAM_CortexM0P", "SAMD21"],
-        "supported_toolchains": ["GCC_ARM", "ARM", "uARM"],
+        "supported_toolchains": ["GCC_ARM", "ARMC5", "uARM"],
         "device_has": [
             "ANALOGIN",
             "ANALOGOUT",
@@ -6713,7 +6713,7 @@
             "TC_ASYNC=true"
         ],
         "extra_labels": ["Atmel", "SAM_CortexM0P", "SAMD21"],
-        "supported_toolchains": ["GCC_ARM", "ARM", "uARM"],
+        "supported_toolchains": ["GCC_ARM", "ARMC5", "uARM"],
         "device_has": [
             "ANALOGIN",
             "ANALOGOUT",
@@ -6747,7 +6747,7 @@
             "TC_ASYNC=true"
         ],
         "extra_labels": ["Atmel", "SAM_CortexM0P", "SAML21"],
-        "supported_toolchains": ["GCC_ARM", "ARM", "uARM"],
+        "supported_toolchains": ["GCC_ARM", "ARMC5", "uARM"],
         "device_has": [
             "ANALOGIN",
             "ANALOGOUT",