diff --git a/tests/periph_timer/Makefile b/tests/periph_timer/Makefile
index 94a4ea9b08..ba13073ddc 100644
--- a/tests/periph_timer/Makefile
+++ b/tests/periph_timer/Makefile
@@ -2,7 +2,7 @@ include ../Makefile.tests_common
 
 FEATURES_REQUIRED = periph_timer
 
-BOARDS_TIMER_25kHz := \
+BOARDS_TIMER_250kHz := \
     arduino-duemilanove \
     arduino-leonardo \
     arduino-mega2560 \
@@ -34,7 +34,7 @@ BOARDS_TIMER_CLOCK_CORECLOCK := \
   remote-revb \
   #
 
-ifneq (,$(filter $(BOARDS_TIMER_25kHz),$(BOARD)))
+ifneq (,$(filter $(BOARDS_TIMER_250kHz),$(BOARD)))
   TIMER_SPEED ?= 250000
 else ifneq (,$(filter $(BOARDS_TIMER_32kHz),$(BOARD)))
   TIMER_SPEED ?= 32768