diff --git a/package/flashrom/flashrom.mk b/package/flashrom/flashrom.mk
index 4ecdce8f41..f9ab6294a5 100644
--- a/package/flashrom/flashrom.mk
+++ b/package/flashrom/flashrom.mk
@@ -12,7 +12,8 @@ FLASHROM_LICENSE = GPL-2.0+
 FLASHROM_LICENSE_FILES = COPYING
 
 define FLASHROM_BUILD_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE) $(TARGET_CONFIGURE_OPTS) -C $(@D)
+	$(TARGET_MAKE_ENV) $(MAKE) $(TARGET_CONFIGURE_OPTS) \
+		CFLAGS="$(TARGET_CFLAGS) -DHAVE_STRNLEN" -C $(@D)
 endef
 
 define FLASHROM_INSTALL_TARGET_CMDS