diff --git a/src/config.ts b/src/config.ts
index c71db36..f1102d6 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -62,7 +62,7 @@ export class CacheConfig {
 
     let key = core.getInput("prefix-key") || "v0-rust";
 
-    self.incremental = core.getInput("incremental").toLowerCase() == "true";
+
 
     const sharedKey = core.getInput("shared-key");
     if (sharedKey) {
@@ -124,6 +124,10 @@ export class CacheConfig {
 
     self.restoreKey = key;
 
+    // Make sure we consider incremental builds
+    self.incremental = core.getInput("incremental").toLowerCase() == "true";
+    hasher.update(`incremental=${self.incremental}`);
+
     // Construct the lockfiles portion of the key:
     // This considers all the files found via globbing for various manifests
     // and lockfiles.