diff --git a/lib/libcompiler_rt/Makefile b/lib/libcompiler_rt/Makefile
index 2fb78ff0dcb2..5c2d38e8c4ec 100644
--- a/lib/libcompiler_rt/Makefile
+++ b/lib/libcompiler_rt/Makefile
@@ -16,6 +16,10 @@ CFLAGS+=	-I${SRCTOP}/contrib/libcxxrt
 CWARNFLAGS.gcc_personality_v0.c+= -Wno-typedef-redefinition
 .endif
 
+# gcc has incompatible internal declarations for __divtc3 and __multc3, but has
+# no option to silence its warning, so make warnings non-fatal.
+NO_WERROR.gcc=
+
 .include "Makefile.inc"
 
 .if ${MK_INSTALLLIB} != "no"