diff --git a/cc3200/bootmgr/bootloader.mk b/cc3200/bootmgr/bootloader.mk
index a74579d1c..da02a02d0 100644
--- a/cc3200/bootmgr/bootloader.mk
+++ b/cc3200/bootmgr/bootloader.mk
@@ -67,8 +67,13 @@ BOOT_STM_SRC_C = $(addprefix stmhal/,\
 	printf.c \
 	)
 
+BOOT_LIB_SRC_C = $(addprefix lib/,\
+	libc/string0.c \
+	)
+
 OBJ  = $(addprefix $(BUILD)/, $(BOOT_HAL_SRC_C:.c=.o) $(BOOT_SL_SRC_C:.c=.o) $(BOOT_CC3100_SRC_C:.c=.o) $(BOOT_UTIL_SRC_C:.c=.o) $(BOOT_MISC_SRC_C:.c=.o))
 OBJ += $(addprefix $(BUILD)/, $(BOOT_MAIN_SRC_C:.c=.o) $(BOOT_MAIN_SRC_S:.s=.o) $(BOOT_PY_SRC_C:.c=.o) $(BOOT_STM_SRC_C:.c=.o))
+OBJ += $(addprefix $(BUILD)/, $(BOOT_LIB_SRC_C:.c=.o))
 
 # Add the linker script
 LINKER_SCRIPT = bootmgr/bootmgr.lds
diff --git a/cc3200/util/std.h b/cc3200/util/std.h
index 2b23fb63e..a74c90e25 100644
--- a/cc3200/util/std.h
+++ b/cc3200/util/std.h
@@ -29,6 +29,7 @@
 
 typedef unsigned int size_t;
 
+int printf(const char *fmt, ...);
 int snprintf(char *str, size_t size, const char *fmt, ...);
 
 // Convenience function, defined in main.c.