diff --git a/package.json b/package.json
index d3cbd4c..27074fc 100644
--- a/package.json
+++ b/package.json
@@ -62,7 +62,7 @@
           "type": "string",
           "default": "-1",
           "description": "The memory limit of the php language server. [Number][K|M|G]. Use '-1' to allow unlimited use of the RAM(default).",
-          "pattern": "^\\d+(?:K|M|G|)$"
+          "pattern": "^\\d+[KMG]?$"
         }
       }
     }
diff --git a/src/extension.ts b/src/extension.ts
index cd64bfe..028120e 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -14,7 +14,7 @@ export async function activate(context: vscode.ExtensionContext): Promise<void>
 
     const memoryLimit = conf.get<string>('memoryLimit') || '-1';
 
-    if (memoryLimit !== '-1' && !/^\d+(?:K|M|G|)$/.exec(memoryLimit)) {
+    if (memoryLimit !== '-1' && !/^\d+[KMG]?$/.exec(memoryLimit)) {
         const selected = await vscode.window.showErrorMessage(
             'The memory limit you\'d provided is not numeric, nor "-1" nor valid php shorthand notation!',
             'Open settings'