diff --git a/knots/resource-pool.scm b/knots/resource-pool.scm
index 5a8e2e0..8092a3a 100644
--- a/knots/resource-pool.scm
+++ b/knots/resource-pool.scm
@@ -138,7 +138,7 @@
 (define-inlinable (decrement-resource-checkout-count! resource)
   (set-resource-details-checkout-count!
    resource
-   (1+ (resource-details-checkout-count resource))))
+   (1- (resource-details-checkout-count resource))))
 
 (define (spawn-fiber-for-checkout channel
                                   reply-channel