diff --git a/generator/generator.js b/generator/generator.js
index 16cf464..e6447b6 100644
--- a/generator/generator.js
+++ b/generator/generator.js
@@ -106,7 +106,16 @@ const addResource = (map, fileName, generator) => {
 	// No; add to the map
 	
 	const suffix = fileName.trim().replace(/\W+/g, '_');
-	const variable = /^[^A-Za-z_]/.test(suffix) ? '_' + suffix : suffix;
+	const variableCandidate = /^[^A-Za-z_]/.test(suffix) ? '_' + suffix : suffix;
+	
+	// Check if the variable name is duplicated
+	// TODO: Cache the existing variables to speed up the verification
+	let variable = variableCandidate;
+	let variableSuffix = 1;
+	const existingVariables = Object.values(map).map(o => o.variable);
+	while (existingVariables.includes(variable)) {
+		variable = variableCandidate + '_' + variableSuffix++;
+	}
 	
 	map[fileName] = {
 		variable,
diff --git a/package.json b/package.json
index 2f8ca1e..06159a7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "choice4genesis",
-  "version": "0.14.1",
+  "version": "0.14.2",
   "description": "A ChoiceScript clone that generates SGDK-compatible C source for the Sega Genesis ",
   "main": "index.js",
   "targets": {