diff --git a/makefiles/tools/openocd-adapters/dap.inc.mk b/makefiles/tools/openocd-adapters/dap.inc.mk
index c93fc61a9f..e3a2c691a5 100644
--- a/makefiles/tools/openocd-adapters/dap.inc.mk
+++ b/makefiles/tools/openocd-adapters/dap.inc.mk
@@ -4,4 +4,3 @@ OPENOCD_ADAPTER_INIT ?= -c 'source [find interface/cmsis-dap.cfg]'
 ifneq (,$(DEBUG_ADAPTER_ID))
   OPENOCD_ADAPTER_INIT += -c 'cmsis_dap_serial $(DEBUG_ADAPTER_ID)'
 endif
-export OPENOCD_ADAPTER_INIT
diff --git a/makefiles/tools/openocd-adapters/iotlab.inc.mk b/makefiles/tools/openocd-adapters/iotlab.inc.mk
index f5d6e84cbf..dfd77d4e00 100644
--- a/makefiles/tools/openocd-adapters/iotlab.inc.mk
+++ b/makefiles/tools/openocd-adapters/iotlab.inc.mk
@@ -5,4 +5,3 @@ OPENOCD_ADAPTER_INIT ?= -c 'source [find interface/ftdi/iotlab-usb.cfg]'
 ifneq (,$(DEBUG_ADAPTER_ID))
   OPENOCD_ADAPTER_INIT += -c 'ftdi_serial $(DEBUG_ADAPTER_ID)'
 endif
-export OPENOCD_ADAPTER_INIT
diff --git a/makefiles/tools/openocd-adapters/jlink.inc.mk b/makefiles/tools/openocd-adapters/jlink.inc.mk
index c57e0119d7..ce7137fbc0 100644
--- a/makefiles/tools/openocd-adapters/jlink.inc.mk
+++ b/makefiles/tools/openocd-adapters/jlink.inc.mk
@@ -4,4 +4,3 @@ OPENOCD_ADAPTER_INIT ?= -c 'source [find interface/jlink.cfg]'
 ifneq (,$(DEBUG_ADAPTER_ID))
   OPENOCD_ADAPTER_INIT += -c 'jlink serial $(DEBUG_ADAPTER_ID)'
 endif
-export OPENOCD_ADAPTER_INIT
diff --git a/makefiles/tools/openocd-adapters/mulle.inc.mk b/makefiles/tools/openocd-adapters/mulle.inc.mk
index 4e1da73428..347d83a17c 100644
--- a/makefiles/tools/openocd-adapters/mulle.inc.mk
+++ b/makefiles/tools/openocd-adapters/mulle.inc.mk
@@ -30,4 +30,3 @@ OPENOCD_ADAPTER_INIT ?= -f '$(RIOTBASE)/boards/mulle/dist/openocd/mulle-programm
 ifneq (,$(DEBUG_ADAPTER_ID))
   OPENOCD_ADAPTER_INIT += -c 'ftdi_serial $(DEBUG_ADAPTER_ID)'
 endif
-export OPENOCD_ADAPTER_INIT
diff --git a/makefiles/tools/openocd-adapters/stlink.inc.mk b/makefiles/tools/openocd-adapters/stlink.inc.mk
index 4dc8a870b9..0e1fcaa1e6 100644
--- a/makefiles/tools/openocd-adapters/stlink.inc.mk
+++ b/makefiles/tools/openocd-adapters/stlink.inc.mk
@@ -10,7 +10,6 @@ OPENOCD_ADAPTER_INIT ?= \
 ifneq (,$(DEBUG_ADAPTER_ID))
   OPENOCD_ADAPTER_INIT += -c 'hla_serial $(DEBUG_ADAPTER_ID)'
 endif
-export OPENOCD_ADAPTER_INIT
 
 # if no openocd specific configuration file, check for default locations:
 # 1. Using the default dist/openocd.cfg (automatically set by openocd.sh)
diff --git a/makefiles/tools/openocd-adapters/sysfs_gpio.inc.mk b/makefiles/tools/openocd-adapters/sysfs_gpio.inc.mk
index eed5498bcf..8a221832a5 100644
--- a/makefiles/tools/openocd-adapters/sysfs_gpio.inc.mk
+++ b/makefiles/tools/openocd-adapters/sysfs_gpio.inc.mk
@@ -11,5 +11,3 @@ OPENOCD_ADAPTER_INIT ?= \
   -c 'sysfsgpio_srst_num $(SRST_PIN)' \
   -c 'adapter_nsrst_delay 100' \
   -c 'adapter_nsrst_assert_width 100'
-
-export OPENOCD_ADAPTER_INIT