diff --git a/boards/pca10005/Makefile.include b/boards/pca10005/Makefile.include
index a9ab5ec5be..93b1f0d52d 100644
--- a/boards/pca10005/Makefile.include
+++ b/boards/pca10005/Makefile.include
@@ -32,10 +32,10 @@ export RESET = $(RIOTBOARD)/$(BOARD)/dist/reset.sh
 # define build specific options
 CPU_USAGE = -mcpu=cortex-m0
 FPU_USAGE =
-export CFLAGS += -ggdb -g3 -std=gnu99 -Os -Wall -Wstrict-prototypes $(CPU_USAGE) $(FPU_USAGE) -mlittle-endian -mthumb -mthumb-interwork -nostartfiles
+export CFLAGS += -ggdb -g3 -std=gnu99 -Os -Wall -Wstrict-prototypes $(CPU_USAGE) $(FPU_USAGE) -mlittle-endian -mthumb -mno-thumb-interwork -nostartfiles
 export CFLAGS += -ffunction-sections -fdata-sections -fno-builtin
 export ASFLAGS += -ggdb -g3 $(CPU_USAGE) $(FPU_USAGE) -mlittle-endian
-export LINKFLAGS += -g3 -ggdb -std=gnu99 $(CPU_USAGE) $(FPU_USAGE) -mlittle-endian -static -lgcc -mthumb -mthumb-interwork -nostartfiles
+export LINKFLAGS += -g3 -ggdb -std=gnu99 $(CPU_USAGE) $(FPU_USAGE) -mlittle-endian -static -lgcc -mthumb -mno-thumb-interwork -nostartfiles
 # $(LINKERSCRIPT) is specified in cpu/Makefile.include
 export LINKFLAGS += -T$(LINKERSCRIPT)
 export OFLAGS = -O binary