diff --git a/infra/libfuzzer-pipeline.groovy b/infra/libfuzzer-pipeline.groovy
index 683740c20..ce6b9e003 100644
--- a/infra/libfuzzer-pipeline.groovy
+++ b/infra/libfuzzer-pipeline.groovy
@@ -60,7 +60,7 @@ def call(body) {
           }
 
           if (dockerContextDir == null) {
-            dockerContextDir = new File(dockerfile)
+            dockerContextDir = new File(workspace, dockerfile)
                 .getAbsoluteFile()
                 .getParentFile()
                 .getAbsolutePath();