diff --git a/cpu/arm/stm32f103/Makefile.stm32f103 b/cpu/arm/stm32f103/Makefile.stm32f103
index b1917a8cd..bff191c64 100644
--- a/cpu/arm/stm32f103/Makefile.stm32f103
+++ b/cpu/arm/stm32f103/Makefile.stm32f103
@@ -6,7 +6,7 @@ SUBTARGET = CB
 
 ### Code common for all ARM CPUs
 
-CONTIKI_CPU_ARM=$(CONTIKI)/cpu/arm/
+CONTIKI_CPU_ARM=$(CONTIKI)/cpu/arm
 CONTIKI_CPU_ARM_COMMON=$(CONTIKI_CPU_ARM)/common
 
 ### Define the CPU directory