diff --git a/.ci/disable_formats.sh b/.ci/disable_formats.sh
index dae0e1b9551..ba882090b40 100755
--- a/.ci/disable_formats.sh
+++ b/.ci/disable_formats.sh
@@ -11,6 +11,10 @@ echo 'KeePass-opencl = Y' >> ../run/john-local.conf
 # These formats fail OpenCL CPU runtime
 echo 'RAR-opencl = Y' >> ../run/john-local.conf
 
+# SunMD5 format crashes on ARM. macOS and Linux
+# See https://github.com/openwall/john/issues/5296
+echo 'sunmd5 = Y' >> ../run/john-local.conf
+
 # These formats run very slowly inside CI
 # Time measures are from Intel CPU driver running inside Docker
 echo 'ansible-opencl = Y' >> ../run/john-local.conf    # (282.202952 secs) PASS
diff --git a/.circleci/circle-ci.sh b/.circleci/circle-ci.sh
index 87a187e5e70..3123c249fe9 100755
--- a/.circleci/circle-ci.sh
+++ b/.circleci/circle-ci.sh
@@ -66,6 +66,9 @@ if [[ $1 == "BUILD" ]]; then
     echo '--------------------------------------------------------------------------------'
 
 elif [[ $1 == "TEST" ]]; then
+    # Disable problematic formats before testing
+    source ../.ci/disable_formats.sh
+
     echo '---------------------------------- Build Info ----------------------------------'
     $WINE $JTR --list=build-info
     echo '--------------------------------------------------------------------------------'