diff --git a/src/vs/workbench/services/configurationResolver/common/variableResolver.ts b/src/vs/workbench/services/configurationResolver/common/variableResolver.ts
index 0e8f1292f593deefb9808419dd87f20882a91144..f342ea2c1feea3fed7e537ddb0617fee5a8a5103 100644
--- a/src/vs/workbench/services/configurationResolver/common/variableResolver.ts
+++ b/src/vs/workbench/services/configurationResolver/common/variableResolver.ts
@@ -326,7 +326,7 @@ export class AbstractVariableResolverService implements IConfigurationResolverSe
 						}
 						return match;
 
-					case 'dirSep':
+					case 'pathSeparator':
 						return paths.sep;
 
 					default: