diff --git a/src/compiler.ts b/src/compiler.ts
index 4893254..47e09b4 100644
--- a/src/compiler.ts
+++ b/src/compiler.ts
@@ -1,6 +1,8 @@
 import type { AST, Pattern, Definition } from './ast';
 import { _rt, store } from './runtime-js';
 
+let matchCounter = 0;
+
 export const definitions: Map<string, AST> = new Map();
 export const dependencies: Map<string, Set<string>> = new Map();
 export const dependents: Map<string, Set<string>> = new Map();
@@ -135,7 +137,7 @@ function sanitizeName(name: string): string {
 
 function compileMatch(ast: AST & { kind: 'match'}, useStore = true, bound = new Set<string>()): string {
     const expr = compile(ast.expr, useStore, bound);
-    const tmpVar = `_m${Math.floor(Math.random() * 10000)}`;
+    const tmpVar = `_m${matchCounter++}`;
 
     let code = `((${tmpVar}) => { `;