diff --git a/package/dhrystone/dhrystone.mk b/package/dhrystone/dhrystone.mk
index d54c8d94e8..f00553d566 100644
--- a/package/dhrystone/dhrystone.mk
+++ b/package/dhrystone/dhrystone.mk
@@ -14,7 +14,7 @@ define DHRYSTONE_EXTRACT_CMDS
 endef
 
 define DHRYSTONE_BUILD_CMDS
-	$(TARGET_CONFIGURE_OPTS) $(MAKE) -C $(@D)
+	$(TARGET_CONFIGURE_OPTS) CFLAGS="$(TARGET_CFLAGS) -std=gnu99" $(MAKE) -C $(@D)
 endef
 
 define DHRYSTONE_INSTALL_TARGET_CMDS