diff --git a/src/vs/workbench/services/configurationResolver/common/variableResolver.ts b/src/vs/workbench/services/configurationResolver/common/variableResolver.ts
index 2236fa4716357..a7d058bba739e 100644
--- a/src/vs/workbench/services/configurationResolver/common/variableResolver.ts
+++ b/src/vs/workbench/services/configurationResolver/common/variableResolver.ts
@@ -321,6 +321,9 @@ export class AbstractVariableResolverService implements IConfigurationResolverSe
 						}
 						return match;
 
+					case 'dirSep':
+						return paths.sep;
+
 					default:
 						try {
 							return this.resolveFromMap(match, variable, commandValueMapping, undefined);