diff --git a/cpu/kw2x/Makefile b/cpu/kw2x/Makefile
index 12ba41f9cf..68605a469b 100644
--- a/cpu/kw2x/Makefile
+++ b/cpu/kw2x/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # add a list of subdirectories, that should also be build
 DIRS = periph $(RIOTCPU)/cortexm_common $(KINETIS_COMMON)
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/kw2x/Makefile.include b/cpu/kw2x/Makefile.include
index 9d48993ba5..14bbd8edff 100644
--- a/cpu/kw2x/Makefile.include
+++ b/cpu/kw2x/Makefile.include
@@ -19,6 +19,6 @@ export CFLAGS += -DCPU_ARCH_$(ARCH)
 export COMMON_STARTUP = $(KINETIS_COMMON)
 
 # add the CPU specific system calls implementations for the linker
-export UNDEF += $(BINDIR)cpu/vector.o
+export UNDEF += $(BINDIR)cpu/vectors.o
 
 include $(RIOTCPU)/Makefile.include.cortexm_common
diff --git a/cpu/kw2x/vector.c b/cpu/kw2x/vectors.c
similarity index 100%
rename from cpu/kw2x/vector.c
rename to cpu/kw2x/vectors.c