diff --git a/circle.yml b/circle.yml
index effc4cbd..fa43b296 100644
--- a/circle.yml
+++ b/circle.yml
@@ -46,12 +46,15 @@ jobs:
           command: |
             go get -u github.com/dvyukov/go-fuzz/go-fuzz github.com/dvyukov/go-fuzz/go-fuzz-build
             go-fuzz-build
-            timeout --preserve-status --signal INT 1m go-fuzz -procs=2
+            timeout --preserve-status --signal INT 1m go-fuzz -dumpcover -procs=2
             test ! "$(ls crashers)"
       - save_cache:
           key: corpus-v2-{{ epoch }}
           paths:
             - corpus
+      - run:
+          name: "Codecov upload (fuzzing)"
+          command: bash <(curl -s https://codecov.io/bash) -F fuzz -f coverprofile
       - run:
           name: "Benchmark"
           command: go test -run=- -bench=. -benchmem