diff --git a/boards/stm32f0discovery/Makefile.include b/boards/stm32f0discovery/Makefile.include
index 2de34acfa4..94058251a9 100644
--- a/boards/stm32f0discovery/Makefile.include
+++ b/boards/stm32f0discovery/Makefile.include
@@ -25,6 +25,7 @@ export OBJCOPY = $(PREFIX)objcopy
 export TERMPROG = $(RIOTBASE)/dist/tools/pyterm/pyterm
 export FLASHER = st-flash
 export DEBUGGER = $(RIOTBOARD)/$(BOARD)/dist/debug.sh
+export DEBUGSERVER = st-util
 
 # define build specific options
 CPU_USAGE = -mcpu=cortex-m0
diff --git a/boards/stm32f3discovery/Makefile.include b/boards/stm32f3discovery/Makefile.include
index 2a16151d01..60a9ea884d 100644
--- a/boards/stm32f3discovery/Makefile.include
+++ b/boards/stm32f3discovery/Makefile.include
@@ -25,6 +25,7 @@ export OBJCOPY = $(PREFIX)objcopy
 export TERMPROG = $(RIOTBASE)/dist/tools/pyterm/pyterm
 export FLASHER = st-flash
 export DEBUGGER = $(RIOTBOARD)/$(BOARD)/dist/debug.sh
+export DEBUGSERVER = st-util
 
 # define build specific options
 CPU_USAGE = -mcpu=cortex-m4
diff --git a/boards/stm32f4discovery/Makefile.include b/boards/stm32f4discovery/Makefile.include
index 45aa0ad92b..6919759a3a 100644
--- a/boards/stm32f4discovery/Makefile.include
+++ b/boards/stm32f4discovery/Makefile.include
@@ -25,6 +25,7 @@ export OBJCOPY = $(PREFIX)objcopy
 export TERMPROG = $(RIOTBASE)/dist/tools/pyterm/pyterm
 export FLASHER = st-flash
 export DEBUGGER = $(RIOTBOARD)/$(BOARD)/dist/debug.sh
+export DEBUGSERVER = st-util
 
 # define build specific options
 CPU_USAGE = -mcpu=cortex-m4