diff --git a/boards/arduino-mkr1000/Makefile.include b/boards/arduino-mkr1000/Makefile.include
index 480a643165..49a2aecb7b 100644
--- a/boards/arduino-mkr1000/Makefile.include
+++ b/boards/arduino-mkr1000/Makefile.include
@@ -1,5 +1,5 @@
 ifeq ($(PROGRAMMER),jlink)
-  export MKR_JLINK_DEVICE = atsamw25
+  MKR_JLINK_DEVICE = atsamw25
 endif
 
 include $(RIOTBOARD)/common/arduino-mkr/Makefile.include
diff --git a/boards/arduino-mkrfox1200/Makefile.include b/boards/arduino-mkrfox1200/Makefile.include
index f4b6f8e18d..dca62495f8 100644
--- a/boards/arduino-mkrfox1200/Makefile.include
+++ b/boards/arduino-mkrfox1200/Makefile.include
@@ -1,5 +1,5 @@
 ifeq ($(PROGRAMMER),jlink)
-  export MKR_JLINK_DEVICE = atsamd21
+  MKR_JLINK_DEVICE = atsamd21
 endif
 
 include $(RIOTBOARD)/common/arduino-mkr/Makefile.include
diff --git a/boards/arduino-mkrwan1300/Makefile.include b/boards/arduino-mkrwan1300/Makefile.include
index b131e8d21a..6d5a527d53 100644
--- a/boards/arduino-mkrwan1300/Makefile.include
+++ b/boards/arduino-mkrwan1300/Makefile.include
@@ -1,5 +1,5 @@
 ifeq ($(PROGRAMMER),jlink)
-  export MKR_JLINK_DEVICE = atsamd21
+  MKR_JLINK_DEVICE = atsamd21
 endif
 
 include $(RIOTBOARD)/common/arduino-mkr/Makefile.include
diff --git a/boards/arduino-mkrzero/Makefile.include b/boards/arduino-mkrzero/Makefile.include
index f4b6f8e18d..dca62495f8 100644
--- a/boards/arduino-mkrzero/Makefile.include
+++ b/boards/arduino-mkrzero/Makefile.include
@@ -1,5 +1,5 @@
 ifeq ($(PROGRAMMER),jlink)
-  export MKR_JLINK_DEVICE = atsamd21
+  MKR_JLINK_DEVICE = atsamd21
 endif
 
 include $(RIOTBOARD)/common/arduino-mkr/Makefile.include