diff --git a/Makefile b/Makefile
index 94b0af5f4..53a80d48c 100644
--- a/Makefile
+++ b/Makefile
@@ -194,6 +194,7 @@ SPEC_CFLAGS += $(call cc-nowarn,missing-field-initializers)
 SPEC_CFLAGS += $(call cc-nowarn,implicit-fallthrough)
 SPEC_CFLAGS += $(call cc-nowarn,stringop-overflow)
 SPEC_CFLAGS += $(call cc-nowarn,cast-function-type)
+SPEC_CFLAGS += $(call cc-nowarn,string-plus-int)
 SPEC_CFLAGS += $(call cc-opt,-Wtype-limits)
 SPEC_CFLAGS += $(call cc-opt,-Wshift-negative-value)
 SPEC_CFLAGS += $(call cc-opt,-Wshift-overflow=2)