diff --git a/tests/periph_rtt_min/Makefile b/tests/periph_rtt_min/Makefile
index c0583244da..82af2f49db 100644
--- a/tests/periph_rtt_min/Makefile
+++ b/tests/periph_rtt_min/Makefile
@@ -6,15 +6,22 @@ USEMODULE += xtimer
 FEATURES_REQUIRED += periph_rtt
 DISABLE_MODULE += periph_init_rtt
 
-SAMPLES ?= 1024
-CFLAGS += -DSAMPLES=$(SAMPLES)
+RIOT_TERMINAL ?= socat
 
 include $(RIOTBASE)/Makefile.include
 
-$(call target-export-variables, test, SAMPLES)
-
 # use highest possible RTT_FREQUENCY for boards that allow it
 ifneq (,$(filter stm32 nrf5%,$(CPU)))
   RTT_FREQUENCY ?= RTT_MAX_FREQUENCY
   CFLAGS += -DRTT_FREQUENCY=$(RTT_FREQUENCY)
 endif
+
+# kinetis rtt runs at 1Hz, reduce samples to speed up the test
+ifneq (,$(filter kinetis,$(CPU)))
+  SAMPLES ?= 64
+else
+  SAMPLES ?= 1024
+endif
+CFLAGS += -DSAMPLES=$(SAMPLES)
+
+$(call target-export-variables, test, SAMPLES)