diff --git a/radio/src/bootloader/Makefile b/radio/src/bootloader/Makefile
index 1093e59f8..e1822258b 100644
--- a/radio/src/bootloader/Makefile
+++ b/radio/src/bootloader/Makefile
@@ -263,8 +263,8 @@ LIBS    = $(DLIBS) $(ULIBS)
 MCFLAGS = -mcpu=$(MCU)
 
 #ASFLAGS = $(MCFLAGS) -g -gdwarf-2 -Wa,-amhls=$(OBJDIR)/$(notdir $(<:.s=.lst)) $(ADEFS)
-CPFLAGS = $(MCFLAGS) $(OPT) -fdata-sections -ffunction-sections  -gdwarf-2 -mthumb -fomit-frame-pointer -Wall -Wstrict-prototypes -fverbose-asm $(DEFS)
-LDFLAGS = $(MCFLAGS) -mthumb -nostartfiles -T$(LDSCRIPT) -Wl,-Map=$(FULL_PRJ).map,--cref,--no-warn-mismatch $(LIBDIR)
+CPFLAGS = $(MCFLAGS) $(OPT) -gdwarf-2 -mthumb -fomit-frame-pointer -Wall -Wstrict-prototypes -fverbose-asm $(DEFS)
+LDFLAGS = $(MCFLAGS) -mthumb -nostartfiles -T$(LDSCRIPT) -Wl,-Map=$(FULL_PRJ).map,--cref,--no-warn-mismatch $(LIBDIR) --specs=nano.specs
 CPPFLAGS = $(MCFLAGS) $(OPT) -gdwarf-2 -mthumb -fomit-frame-pointer -Wall -fverbose-asm $(DEFS)
 
 CPPFLAGS += $(CPPDEFS)