diff --git a/src/commands/spec.ts b/src/commands/spec.ts
index 7df89bb..2436467 100644
--- a/src/commands/spec.ts
+++ b/src/commands/spec.ts
@@ -1,20 +1,20 @@
-import { optFlag, undefList } from "./common"
+import { optFlag, optSwitch, undefList } from "./common";
 
 export interface RunCPUOptions {
     /**
      * Config file, used for compiling flags, compiler versions, etc.
      */
-    config?: string
+    config?: string;
 
     /**
      * SPEC workload scale for each benchmark
      */
-    workload?: "test" | "train" | "ref"
+    workload?: "test" | "train" | "ref";
 
     /**
      * Selected benchmarks
      */
-    benchmarks?: string[]
+    benchmarks?: string[];
 
     buildType?: "nobuild" | "rebuild" | "plain",
 
@@ -49,6 +49,14 @@ export interface RunCPUOptions {
         | "screen"
         /** Plain ASCII text file */
         | "text")[];
+
+
+    /**
+     * Synonyms: none
+     * Default: --setprocgroup
+     * Meaning: Attempt to create all processes in a single group. Improves the chances that ^C will get the whole run, not just one of the children.
+     */
+    setprocgroup?: boolean;
 }
 
 export function runcpuOptions(o: RunCPUOptions): string[] {
@@ -58,14 +66,15 @@ export function runcpuOptions(o: RunCPUOptions): string[] {
         ...undefList(o.buildType, opt => {
             switch (opt) {
                 case "nobuild":
-                    return ["--nobuild"]
+                    return ["--nobuild"];
                 case "rebuild":
-                    return ["--rebuild"]
+                    return ["--rebuild"];
                 case "plain":
-                    return []
+                    return [];
             }
         }),
         ...undefList(o.benchmarks, bench => bench),
         ...undefList(o.outputFormat, of => ["--output_format", of.join(",")]),
-    ]
+        ...optSwitch("--setprocgroup", o.setprocgroup),
+    ];
 }