iterated_hash.c: warning: argument 1 of type ‘unsigned char[20]’ with mismatched bound

On Fedora 33 with custom experimental gcc snapshot version 11.0.0 20210124 I get the following warning:

/opt/gcc-latest/bin/gcc  -I/home/newman/isc/ws/bind9 -I../.. -I./unix/include -I./pthreads/include -I./x86_32/include -I./include -I./include -I/home/newman/isc/ws/bind9/lib/dns/include -I../../lib/dns/include   -D_REENTRANT -DOPENSSL -DPK11_LIB_LOCATION=\"undefined\" -D_GNU_SOURCE -fno-omit-frame-pointer -fno-optimize-sibling-calls -O1 -g -Wall -Wextra -fsanitize=address,undefined -DISC_MEM_USE_INTERNAL_MALLOC=0  -I/usr/include/libxml2    -fPIC  -W -Wall -Wmissing-prototypes -Wcast-qual -Wwrite-strings -Wformat -Wpointer-arith -fno-strict-aliasing -fno-delete-null-pointer-checks  -c iterated_hash.c
iterated_hash.c:21:33: warning: argument 1 of type ‘unsigned char[20]’ with mismatched bound [-Warray-parameter=]
   21 | isc_iterated_hash(unsigned char out[ISC_SHA1_DIGESTLENGTH],
      |                   ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from iterated_hash.c:18:
./include/isc/iterated_hash.h:33:37: note: previously declared as ‘unsigned char[155]’
   33 | int isc_iterated_hash(unsigned char out[NSEC3_MAX_HASH_LENGTH],
      |                       ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~