diff --git a/.circleci/config.yml b/.circleci/config.yml
index cf237bd82639b..81ecb0653c316 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -9,7 +9,7 @@ executors:
   linux-aarch64:
     machine:
       image: ubuntu-2204:current
-    resource_class: arm.medium
+    resource_class: arm.large
 
 jobs: # a basic unit of work in a run
   build_and_test:
diff --git a/recipes/cloudspades/build.sh b/recipes/cloudspades/build.sh
index e90f821227d16..2de2a1721d8fa 100644
--- a/recipes/cloudspades/build.sh
+++ b/recipes/cloudspades/build.sh
@@ -5,7 +5,7 @@ set -e -o pipefail -x
 export LIBRARY_PATH="${PREFIX}/lib"
 export INCLUDE_PATH="${PREFIX}/include"
 export CFLAGS="${CFLAGS} -O3 -fcommon"
-export CXXFLAGS="${CFLAGS} -O3 -fcommon -I${PREFIX}/include -D_LIBCPP_DISABLE_AVAILABILITY"
+export CXXFLAGS="${CFLAGS} -O3 -fcommon -I${PREFIX}/include -D_LIBCPP_DISABLE_AVAILABILITY -fsigned-char"
 
 case $(uname) in
 	Linux)
diff --git a/recipes/cloudspades/meta.yaml b/recipes/cloudspades/meta.yaml
index 7eada7855ec2b..8385d16be8a21 100644
--- a/recipes/cloudspades/meta.yaml
+++ b/recipes/cloudspades/meta.yaml
@@ -11,7 +11,7 @@ source:
   sha256: {{ sha256 }}
 
 build:
-  number: 0
+  number: 1
   skip: True  # [osx]
   run_exports:
     - {{ pin_subpackage('cloudspades', max_pin="x") }}
@@ -50,5 +50,7 @@ about:
   doc_url: "https://github.com/ablab/spades/tree/cloudspades-ismb"
 
 extra:
+  additional-platforms:
+    - linux-aarch64
   recipe-maintainers:
     - pdimens