diff --git a/tools/impact b/tools/impact
index 9848b26..da2b0e9 100755
--- a/tools/impact
+++ b/tools/impact
@@ -61,7 +61,7 @@ print_results() {
 
   echo
 
-  echo "(Measured by /tools/impact with Node.js $(node --version) on $(uname --operating-system --machine).)"
+  echo "(Measured by /tools/impact with Node.js $(node --version) on $(uname -mrs).)"
 }
 
 print_usage() {