diff --git a/.cirrus.yml b/.cirrus.yml
index e275ae1871..f03e24b1c2 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -26,6 +26,12 @@ task:
     echo LD_LIBRARY_PATH=`pwd`/lib >> $CIRRUS_ENV
 
     wxPROC_COUNT=`./build/tools/proc_count.sh`
+    # ARM systems have 64 CPUs but run out of memory and crash when using that
+    # many jobs, so limit them to something reasonable.
+    if [ $wxPROC_COUNT -gt 16 ]; then
+      wxPROC_COUNT=16
+    fi
+
     echo wxBUILD_ARGS=-j$wxPROC_COUNT >> $CIRRUS_ENV
 
     WX_EXTRA_PACKAGES='ccache git'