diff --git a/boards/sltb001a/Makefile.include b/boards/sltb001a/Makefile.include
index 69d13e8fa4..e7370b65a6 100644
--- a/boards/sltb001a/Makefile.include
+++ b/boards/sltb001a/Makefile.include
@@ -11,6 +11,7 @@ include $(RIOTMAKE)/tools/serial.inc.mk
 
 # setup JLink for flashing
 export JLINK_DEVICE := EFR32MG1PxxxF256
+export JLINK_PRE_FLASH = r
 include $(RIOTMAKE)/tools/jlink.inc.mk
 
 # add board common drivers