diff --git a/core/src/garden.ts b/core/src/garden.ts
index 171f102433..1dc8da215d 100644
--- a/core/src/garden.ts
+++ b/core/src/garden.ts
@@ -1522,10 +1522,16 @@ export class Garden {
     }
 
     const context = new TemplatableConfigContext(this, config)
+    // Inject action's variables
+    context.variables = context.var = {
+      ...context.variables,
+      ...config.variables,
+    }
 
     return resolveTemplateString({
       string: disabledFlag,
       context,
+      contextOpts: { allowPartial: false },
     })
   }