diff --git a/script/rspec-slow-repeat b/script/rspec-slow-repeat
index 797ca46126..649e57f2ba 100755
--- a/script/rspec-slow-repeat
+++ b/script/rspec-slow-repeat
@@ -15,7 +15,17 @@ fi
 
 n="$1"
 passed=0
-processors="`cat /proc/cpuinfo | grep -c processor`"
+
+# Check via uname the environment we are running in to get the number of cores
+if [[ "`uname`" == "Darwin" ]]; then
+  processors="`sysctl -n hw.ncpu.`"
+  env="mac"
+else
+  processors="`cat /proc/cpuinfo | grep -c processor`"
+  env="linux"
+fi
+
+echo "Running $n times on a $env with $processors cores"
 
 for i in `seq $processors`; do
   yes > /dev/null &